So we ended with a project that took about two weeks. I knew it had to be something that was
able to work so I chose one of the devices I had made (the four b@r link@ge) and scaled it down
to make it. Even then, there were challenges. For example, the first time I scaled it down,
I also scaled down the thickness. Turns out, with my measurements, the scaled down thickness
would have meant that only two strands of plastic would be printed, so that it would break too
easily. So I scaled it up x5. But I made a mistake and the first device didn't work (because of
my carelessness), fully (the crank and tolerances were fine). The second time it worked,
and mine was one of the few that actually had movement and tolerances that worked (hurray!)
If you don't use the right tolerances when printing, the printer can default between (say you picked .01) one and round it to a zero (meaning the tolerance would now be 0) and then fuse your parts together. So some people had parts that didn't move because they were fused together.
Also, drainage is important. Our printer printed a part with a base, and then had to sit in a bath
where the support pieces and base would wash away. So depending on how you built your
model, there wouldn't be enough drainage and therefore not all the support pieces would wash
away, leaving parts that wouldn't work/ turn. Also, the direction in which you decided
to print the model is important. Printing side ways is not as great for printing circles/circular objects
as it was from the bottom to top position. It's quite interesting stuff. After mine took about 3 hours
to print, it still had to sit in a bath for about 8 hours to get out the support material/base it printed, along with the model.
In the video, you can hear a classmate talking about some of the difficulties she had in making her model.
A great learning experience, a lot of work and one in which it was worthwhile to keep things simple.
Two weeks is NOT a lot of time and some people BARELY finished. One guy had a great little device, but it was STILL printing, so he had NO model to present for his final, and took a photo of
the computer screen file that was printing as he gave his presentation :)
It may be worthwhile in the future for me to buy my own 3D printer. The process is actually not
that complicated and it's great for design. And it's not too expensive (depending on your budget). There are also ones that do metal, which is interesting; a classmate who works in aerospace was telling me about it.
My project is of course, inspired by motion, and the four b@r link@ge system, and ratios used in Computational models which translate into mechanical models to create different characteristics. Oh, and you should check out B0B P0tt's work! It's BEAUTIFUL!!!!