The right stuff

There are three markers of endurance fitness: aerobic capacity, anaerobic threshold, and economy

• Aerobic capacity: AKA “VO2max”, is a measure of how much oxygen you are capable of using when riding at a maximal effort for a few minutes
• Anaerobic threshold: the percentage of your aerobic capacity that you are capable of sustaining for a long time, such as 40 to 70 minutes
• Economy: tied to all metrics of performance in that it has to do with how much energy you waste while riding (e.g. physical structure, pedaling style, position on the bike, and bike-handling skills)

Power duration curve and phenotype

This is a huge generalization, but it shows that performance can be predicted from metrics

• Climbers: can maintain high power outputs even over long durations. Best predictor of success is power to weight ratio
• Sprinters: even higher power outputs with short bursts but drops off quickly over long durations
• Time trialists: Best predictor of success is power at anaerobic threshold. Aerodynamic drag is the biggest obstacle since often courses are quite flat
• All-rounders: someone who is pretty good at at least two of the above and they are often contenders when course conditions don’t favour the specialists

Training beliefs

The athlete must have faith that he is going down the right path for training, and follow the path beginning to end

Some people respond quickly, while some slowly. Some people have muscles made for endurance while others made for power, and it’s the rider’s job to adjust his training based on what he’s know about himself.

Training is always a moving target – what worked last season may not produce the same results

Four steps to training with a purpose

There is no one-size fits all way of training

1. Clear goal – well-defined goal drives training outcome. Even workouts need to have a goal. The combination of the workout goals ultimately point to the season’s goal
2. Expert instruction – e.g coach, mentor, training partner, or even yourself (i.e. by reading this book)
3. Specific practice – Everything done should follow the goal and the expert instruction. Training alone is ideal as it allows control over all aspects of workout without accounting for someone else
4. Immediate feedback – Review data as the workout is happening or immediately after. Need to stay mentally engaged with how one feels during workout

Previous: Chapter 1 – Mental performance
Chapter list: Chapter summaries

This post from askubuntu.com hits this issue right on the head: http://askubuntu.com/questions/333534/installing-epson-wf-3520

I thought I’d leave a post here, just so I know where to find it again in case I forget.

Print Volume

This is the amount volume that the printer is able to print in.  Generally, the measurement is given by the three dimensions of a rectangular prism.  The thing to watch out for here is that just because a printer has a large print volume, it does not mean the printer can reliably print in all of it.  Say the design calls for a thin flat plate.  If the plate is too wide, then the edges of the plate will peel/warp during the print and the flat shape that was intended will be slightly curved.  To visualize what warping is, imagine a flat plate lying on the print bed as it is being printed.  Warping is when the corners of the plate start peeling off the base during a print.  Warping will be explained in a little more detail later on.

Resolution

This describes the accuracy of the nozzle’s positioning.  It is usually measured in microns or inches.  Clearly a smaller value means that the printer will be more accurate in its position.

Layer Thickness

Because the printer works by extruding layers of plastic, thinner layers allow for more fine details.  However, more layers means that the part will take longer to print (all other things being equal).

Print Speed

3D printing is generally a slow process, but a faster print speed could definitely help offset that.

Nozzle Diameter

A small nozzle diameter means that the extruded plastic will be narrow and thus allow for fine details.  It also improves the smoothness of the printed object.

Ease of Removing Parts off the Platform

Because during a print, the base of the part (ideally) should be firmly adhered to the print bed, one must take care when removing the part from the print bed.  In some cases, removing a part requires a little bit of force to pry the part off the print bed.  This application of force may affect the alignment of the print bed relative to the nozzle.  In lower quality printers this can permanently affect the alignment or require frequent re-calibration   Seeing how “rigid” the print bed assembly can help assess how the machine accuracy can be affect during part removal.  For example, if the print bed is mounted on really large support structure, then the affect of misalignment is less of a problem than a machine where the print bed is mounted in a smaller support.

Enclosure

Some printers enclose the part to be printed in a box and some don’t.  The reason an enclosure exists is so that the machine is able to prevent the part being printed from losing too much heat during print.  Loss of heat during a print negatively affects the adhesion of the printed plastic.  Also a larger temperature difference means the part will warp more.  Without an enclosure, heat is able to freely transfer to the ambient.  High quality printers generally have an enclosure.

Variety of Printed Materials

A common material to print with is ABS.  Other materials such as PLA can be printed as well.  The use of the particular material can be quite dependent on the application of the printed part.  The cost of material also differs.  It is worthwhile to determine what material will be printed.  In many cases, ABS should be sufficient.

Warping

This is probably one of the biggest limitations of 3D printing.  Because of the use of heat during print, it is natural for the part to shrink as it cools down.  The problem is that the shrinkage is not uniform.  Some parts of the model shrink more than others and most of the time it is very unpredictable.  While there are some general guidelines that designers can follow to reduce warping, there are definitely some machine features that are good to have to help reduce warping even further.  Because the nature of the way the printer prints is that plastic is extruded layer by layer, the plastic layer at the very bottom is the first to cool down.  Cooling down means shrinkage.  This also means that as the bottom of the model shrinks, the printer is still printing on top of a slightly shrunken part.  Sometimes the shrinkage can be so bad that the part pulls itself off the print bed.  When the part is no longer securely adhered to the print bed, the part may slide around and ruin the entire print.  Warping is the enemy of 3D printing.

Below are some qualities of a machine that help reduce shrinkage:

• Heated print bed – a heated print bed keeps the plastic hot during the print and does not let the base cool down as much as if there were no heated print bed
• Enclosure – described above

There are more ways to reduce warping that the designer can do, but that is outside the scope of this article.

Number of Nozzles

A lot of printers just have the one print nozzle, but there are some with multiple.  This allows printing with multiple colours or in some cases printing with a water soluble support material.  Generally, support material has to be manually removed from the printed part, but if the support material is water soluble, this saves a lot of the manual labor involved in cleaning up the model.

Nozzle Maintenance

Through extended use, the nozzle can become quite dirty, that is black gunk starts building up on the surface of the nozzle.  If one is not careful, this can clog the print nozzle.  It is worthwhile to find out how often the nozzle needs to be replaced.  There are also other factors that may result in the need to replace a nozzle.  This is a recurring cost of maintaining the printer.  Some nozzles are cheaper and more common than others and it is worth it to see how often the nozzle needs to be replaced and how much it will cost each time.  Machines may come with extra nozzles.

Lubrication

Over time, moving parts may have to be lubricated.  Printers should come with a maintenance manual to help instruct the user how to do this.  It is also helpful to know the cost of the lubricant and how often it will be required.

Machine Lifetime Cost

Aside from the cost of the machine, operating a 3D printer can also incur the following costs:

• Shipping
• Insurance
• Brokerage fees
• Tools for removing support material
• Currency conversion
• Sales tax
• Print material (recurring)
• Replacement nozzles (recurring)
• Lubricants for moving parts (recurring)

As it can be seen, the extra costs can be quite significant.

Conclusion

Hopefully this has given a good general overview of some of the considerations in buying a 3D printer.  Different people will value different things in the printer and hopefully this subset of possible considerations for buying a 3D printer helps people make a decision as to what to look for in a printer.

Here is my next travel blog entry about my visit to Berlin. In a short three days, we managed hit up quite a few places in the city, especially the historical areas about the Cold War and the Second World War. I would have liked to have posted this sooner, but my computer refused to cooperate.

Massive Train Delay

I was always under the impression that the Deutsche Bahn was always on time, but I guess that’s not true anymore. The City Night Line was supposed to leave at 12 AM from Mannheim and arrive in Berlin at around 7:30, but due to a train crash causing a chemical spill in Switzerland, our train took a detour. It arrived three and a half hours late. At first it was supposed to only be a 170 minute delay, but as time went on, the delay went longer and longer. To pass the time, we walked around Mannheim late at night, and pretty much saw the entire city, AKA the schloss, in about an hour. We spent the rest of the time just moping around the station. It was cold at night too and I never expected to be waiting so long so I ended up freezing when I was outside. I tried sleeping on the benches, but that didn’t really work for me, and instead ended up sitting there eating snacks until the train came. Maybe we should have chilled at a bar instead. Because of the long wait for the train, I didn’t sleep too well. It also didn’t help that I forgot to reserve a spot that had a bed, and I instead reserved a reclining seat instead. Because of the late train, the conductors handed out a giant form in pure German for people to fill out to get part of their money back.

Berlin Hauptbahnhof

We arrived in Berlin at about 10:30 in the morning, 3 hours later than scheduled. We all got off the train, still super tired, and started our journey in Berlin. The Berlin main station was the biggest station I’d seen so far. It had a really modern look using glass everywhere they could. Its sheer size allowed for a lot of businesses to open inside the station. The station had three floors with two floors used as train platforms. Coincidentally, it was also the station’s fifth birthday. When we got outside, we could see the German Reichstag within a walkable distance.

German Reichstag

Seeing that we could already see the Reichstag when we walked out of the Hauptbahnhof, we proceeded there first. Since I played so many World War II games, I already knew what the Reichstag looked like. Over the years, the Reichstag underwent a few renovations such as the glass dome that was added after the war. The rest of the building looked so similar to what I had seen in video games and historical photos that as I walked up the stairs, it briefly reminded of me of the guy with the flamethrower in the cut-scene in Call of Duty 5. I also remembered some of the iconic photographs I’d seen such as the soldier waving the flag of the Soviet Union on the roof.

Prior to going to Berlin, I had reserved spots for the roof terrace and the dome (according to their website, people couldn’t go up there without a reservation). Before going in, I had to put my stuff through their X-Ray machine (maybe they’re afraid of terrorists or something). They had confiscated my Swiss Army Knife for the duration that I was up there. At the roof terrace, the staff issued audio guides to every guest. While walking to different areas of the dome, the audio guide would automatically begin talking about parts of the city that one could see from that part of the dome. I didn’t really pay attention to the boring voice of the audio guide and the information that it had wasn’t all that interesting (it really didn’t matter to me if I knew how many rooms were in a particular building or the land area it took up).

Brandenburg Gate

From the top of the Reichstag, we could see the one of the symbols of Germany, the Brandenburg Gate. It is located at one end of the street Unter den Linden, and was used as a sign of peace during the Prussian Empire. Since it is also one of the most famous landmarks in Europe, there were naturally a lot of tourists here. So much so that there were people dressed up in weird costumes to earn money from people taking pictures with them. There were a few people holding American and USSR flags and even people dressed up as Star Wars characters. Near the gate were also a embassies of various countries such as France and the United States. One of the buildings even proudly waved the flag of Quebec (I don’t know why and it wasn’t the Canadian embassy either).

Eastener Hostel

By now, we were already super tired from the lack of sleep and from carrying our bags around all day. We took the city train to our hostel for a quick rest and to drop off some of our stuff. The man at the hostel was super thorough in explaining the rules of the hostel (with his East German accent) and even took the time to give us a map and point of the major tourist destinations on it. Using this map, we were able to find all the places we wanted to go to. By the end of the trip, the map had tears in several places and random folds here and there, clearly showing how intensely I used it.

Ampelmann

While walking around the city, I noticed that the pedestrian traffic light signals had a different design than the rest of Germany. Apparently, the traffic light man used in some places in Berlin were based off of the design used in former East Germany. I thought this Ampelmann guy was pretty cool.

The Remains of the Berlin Wall near Nordbahnhof

One of the locations that the map pointed us to were to some of the remnants of the Berlin Wall. Before coming to Berlin, I had a thought of posing at the wall with a hammer, but I never got one and I don’t think the people would have been very happy with me doing that. The segments of the wall here showed a lot of graffiti along its entire length. The city also preserved the guard tower and showed some of the methods of preventing escapes. Also in the area was a memorial for those who died while trying to flee to West Germany.

East German Cars

One of the peculiar things about Berlin was the fact that tourists can still take rides in cars (known as a Trabant or Trabi for short) that the GDR once used. I looked inside one of them and it just seemed so old and run down. I figure the only reason that these cars are still around are because of their historical/moneymaking value.

Really Cool Old-Style German Font

When I walked through some of the old train stations, I came across a really cool looking vintage font that I felt was so characteristic of Germany. Maybe I watched too many documentaries or something.

Checkpoint Charlie

Taking the train from Nordbahnhof, we made our way to Checkpoint Charlie, one of the border crossings once used before the unification of East and West Germany. The old border crossing booth and the sign telling people they’re leaving the American Sector still remains today. Standing outside are also two people holding American flags. Near the border booth, there is a giant sign with an American soldier on it and on the reverse side, there is a Soviet soldier. On the street, street vendors sold random things like fur hats with the logo of the Soviet Union on it, gas masks, and flags of the GDR and USSR.

Haus am Checkpoint Charlie

Adjacent to the border crossing, there was a museum dedicated to the documenting the border security between East and West Germany. The museum documented various methods of escape such as hiding people inside the hood of a car and using a hot air balloon. Also displayed were tools that people used to escape like special wall climbing footwear and stories of escapes. Seeing all these different methods made me realize how smart these people were. I would have never thought of something like that. Sadly, I was already super tired while walking through this museum and I was ready to just go back to the hostel and sleep. It was still light out at the time. Unfortunately, we weren’t allowed to take photographs in this museum.

DFB Cup Final

While in Berlin, we saw a lot of people walking around wearing stuff from football teams and apparently the DFB Cup Final was to be played in the Berlin Olympic Stadium. To catch the football game, we went to a bar to tune in. While at this bar, I got to try Berlin-style wheat beer. Theirs was different than the wheat beer I usually drink because here, they had beer cocktails. I tried the red and green Berliner wheat beer. The red one had a raspberry flavour while the green one had a woodruff flavour.

The Fernsehturm

The Fernsehturm is the TV tower where people can go up to see a view of the city. It is also one of the tallest buildings in the European Union. We didn’t go here since we didn’t really care so much about the view and we went to see other landmarks instead.

Potsdamer Platz at Night

According to my boss at work, Potsdamer Platz was a must see at night, and after seeing it for myself, I totally agree with him. The beauty of this place was the architecture that looked so beautiful in the night, especially the Sony Center. The roof of the Sony Center was shaped like an umbrella and its color would gradually change between blue and purple.

Französische Straße

Located on this street were the Französischer Dom, Berlin Concert House, and Deutscher Dom. Each of these three buildings have quite a bit of history and are all have amazing architecture. This place is definitely the place to be to see old-style architecture in Berlin.

Fassbender & Rausch Chocolatiers

This chocolatier is quite well known and their store is frequently visited by tourists. What makes it so special is that they built many of the landmarks in Berlin out of chocolate. Anything made of chocolate is cool. The longer I stayed in this store, the bigger craving for chocolate I had.

Führerbunker

During the Battle of Berlin, Hitler stayed in his bunker beneath his New Reich Chancellery. I went to the location of where the bunker once was only to find the area replaced by pretty regular things like shops and apartments. The side of the street here had plaques explaining the history of this area and its use for Hitler’s Bunker.

Memorial to the Murdered Jews of Europe

Near Hitler’s Bunker was a memorial for the Jewish victims of the holocaust. The memorial had thousands of concrete blocks, or stelae, of varying heights arranged in a grid pattern. According to one of the designers of the memorial, Peter Eisenman, he stated that “the stelae are designed to produce an uneasy, confusing atmosphere, and the whole sculpture aims to represent a supposedly ordered system that has lost touch with human reason.” Walking through the memorial reminded me so much of Bomberman. The memorial had the grid pattern just like in the game. It would probably also be really fun jumping from one block to the next, but it would have been really disrespectful.

Potsdamer Platz during the Day

To take a break and relax during the day, we went back to Potsdamer Platz for a beer. Now I understand why my boss told me to come here at night instead of during the day. It doesn’t look as nice at this hour.

Victory Column

Similar to the Arc de Triomphe on Avenue des Champs-Élysées in Paris, the Victory column stands in the end of the street Unter den Linden and is similarly surrounded by a giant roundabout. The column serves to commemorate the Prussian victories in the Danish-Prussian War, Austro-Prussian War, and the Franco-Prussian War. Surrounding the column are other smaller statues. One of the statues, I thought I saw my last name on it, but looking more closely, I realized it said “Roon” instead of “Poon”. What a bummer.

Schloss Bellevue

Located in the Tiergarten District of Berlin is the official residence of the President of Germany. We sat on the grass outside the residence to take a rest and to admire the beauty of the schloss and to watch the bike race that was happening just on the adjacent road.

Soviet War Memorial

Built using stone from the Reich Chancellery not long after the end of the Second World War, this memorial remembers the war dead of the Soviet Union, particularly the 80 000 soldiers who died in the Battle of Berlin. The memorial is of a statue of a Soviet soldier and on its left and right sides are two 152 mm Howitzer artillery pieces and two T-34 tanks (for some reason, birds like to go inside the barrel of the tank’s main gun). When I looked at the artillery piece, I tried to open the chamber for where the rounds go and tried to change the angle of the gun, but none of that worked. I’m pretty sure they didn’t want people messing with it. Behind the building is a small museum documenting the memorial’s construction and the Battle of Berlin. The memorial used to be guarded by Soviet troops during the Cold War even though it was in the British zone of occupation and now it is managed by the city.

Hackesche Höfe

One of my friends suggested that we go here since this place is known for its beautiful courtyards. It had eight interconnected courtyards, each with its own unique design. Some of the courtyards had tables for people to relax with coffee or beer while others had gardens.

Berliner Dom

Located on Museum Island, the Berliner Dom is a cathedral that belongs to the Evangelical Church. What was weird was that when we arrived there, we saw a group of people there having a cosplay party. There was one guy waving around a flag of the Empire of Japan. I never knew Anime was that big in Germany. Even weirder is that some of these kids were frolicking in the fountain in front of the Dom.

Museum Island

Another well known landmark in Berlin is Museum Island, which is an area with five internationally well known museums. They are the Altes Museum, Neues Museum, Alte Nationalgalerie, Bode Museum, and Pergamon Museum. We didn’t go in any of these museums since none of us were that interested in what the museums had to offer. The Alte Nationalgalerie had a look that seemed to have been inspired by the Greek Parthenon (but I’m not sure). While we were there, the sky started raining for about 15 minutes. It was quite refreshing since it was really hot earlier in the day.

Food

Although we didn’t try any food that were unique to Berlin (such as currywurst), we did splurge for one of our meals, and I found the food we had to be really delicious. Since Berlin is a lot closer to the coast than Stuttgart, I got to enjoy better quality seafood.

New Synagogue

Prior to the Second World War, the synagogue was badly damaged during Kristallnacht and the synagogue could no longer hold any services. Since the war, the synagogue was reconstruct and it is now the main synagogue for the Jewish community in Berlin.

Olympic Stadium

The current stadium was originally built for the 1936 Summer Olympics. Since the stadium was built during the Nazi period, the architecture of the building follows the Nazi style. Apparently, it was at these Olympic games that the tradition of the torch marathon began.

Potsdamer Platz for the Third Time

On our second night in Berlin, we went back to the Sony Center to relax for a little bit again. This time I got to try new kinds of beer such as mango and passion fruit flavoured wheat beer. It had an interesting flavour, but I thought the regular kind tasted a little better.

The Brandenburg Gate and the Reichstag at Night

When we arrived here at night, we found this place to be deserted even though the landmarks here looked amazing in the night. It was a good thing for us since there weren’t any tourists around. It allowed me to get really clear shots of these places.

The East Side Gallery

This area contains a continuous segment of the Berlin Wall that is 1.3 km in length. Along the wall are paintings from artists around the world to promote freedom in the world. The gallery also features the iconic political painting of Leonid Brezhnev and Erich Honecker kissing during the days of the GDR. There was also a souvenir shop here that stamped people’s passports with the GDR stamp for one euro. I thought that was a cool gimmick.

The Topography of Terror

To document the terrible deeds that the Nazi regime and the SS perpetrated between 1933 and 1945, an open-air museum was set up at the site of an old SS installation. It talked about how the Nazi’s transported people from conquered areas to the concentration and extermination camps set up across the continent. There was even a special exhibit just on the war crimes perpetrated by Adolf Eichmann. Near the museum were also SS buildings that have been converted to government offices.

Going Home

After three days of travelling in Berlin, we were all very tired and we were ready to go home. We went to our train platform for the ICE Sprinter about five minutes before the departure to find out that our train wasn’t there. We had no idea were it was and we didn’t want to miss the train. Apparently, some arsonists damaged some parts of the railway so the train ended up stopping on a different platform. Luckily, we found out in time and we managed to get on before it left. On the way back, I got to see some fantastic scenery of the German country side.

Souvenirs

I found that it was this trip that I spent the most money on souvenirs. I ended up buying Ampelmann themed cell phone accessories and a full sized flag of the USSR (not that I’m a communist or anything).

More photos here

Up until now, I’ve never opened an MMS successfully. My Internet settings on the phone were never set
probably plus I never bothered to do it. I also didn’t know the billing rates for opening them either.
But now, an opportunity arose for me to require MMS. The Deutsche Bahn has three options for distributing tickets purchased online. The first one is by printing them out, but I don’t have a printer. The second method is having them mailed to me, but that costs 3.50 euro. The third and best option, is to have them sent as MMS. Knowing that my phone, the P1i, has this ability, I looked for how to do it. After going through lots of Googling and reading through translated German sites, I finally figured it out.

Now, I use Vodafone in Germany, but this method may work on other providers even. I am also using GPRS, and not 3G (I don’t have a dataplan unfortunately). The way to do it is to register an account on Vodafone.de using your phone number. Obviously, if you use a different provider, you’d go to their website to make the account. I clicked through their services and found an option called the “HandyKonfigurator”. What it does is it sends me the proper settings required for my phone. I clicked through the dropdown boxes, found my phone and pressed continue. Vodafone then sent me a file that would inject the settings into my phone. They also sent me a PIN that I had to enter before my phone settings were changed. I did as I was asked, and now I can receive MMS messages!

Vodafone Internet Account Settings

• Address: event.vodafone.de
• No user name and password required
• IP Config and DNS Addresses are set to automatic
• Proxy Server: 139.7.29.17 at port 80

Vodafone MMS Account Settings

• Service Center Address: http://139.7.24.1/servlets/mms

Apparently, the problem was that Adobe Acrobat didn’t have a default scanner set.  I would think the program would have known to use my default scanner device (really just my all-in-one printer), but it never set it.  To enable the scanner:

1. Click the “Create” button and click “Configure Presets”
2. Under the dropdown for the scanning device, choose your scanner
3. Scan away!

This method worked for me seeing that my scanner was already configured except for this little bit here.  If the correct scanner doesn’t show up the list, then it probably wasn’t properly configured to begin with.  In that case, it will take a bit of extra work for scanning to completely work.

1. Start > Run > services.msc or alternatively, type services.msc in the find box in the start menu
2. Look for the Print Spooler and stop the service
3. Once you stop the service, open the folder “C:WindowsSystem32SpoolPrinters”
4. Find the files with the date and time stamp of your print job and delete the files
   • if you are trying to delete a print job on a printer that is not directly connected to your computer, but on a network, the host computer may have to turn off their print spooler in order to delete the files
5. Retry printing

Usually for me, restarting the Print Spooler works well enough, but if need be, deleting the print job files works too.