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Currently I'm interested into parallel motion systems including inverse kinematics. (Read also this amazing article about parallel robots.) So why not build a Stewart platform and experiment some more on this subject. I cutted the wooden parts at a MiniFabLab and now figuring out, how to connect the electronics (my voltmeter and one servo died already..).

I like the 3D printing "hype" a lot. One approach to contribute to this, is making a low-cost raw-material 3D printer. One way of doing this, is making a plaster/gypsum powder based printer. So I bought a second hand Epson printer, replaced the ink of the cartridge with water and did some drop measurements. It's important, that there is comming enough waterdrops (~12 pico liter / drop) out the cartridge, to make a nice powder mixture. The other paramater to play with, is the layer height, which is also influencing the mixture. Currently I believe, that you should print one layer (0.01 mm) three times, for having the right mixture.. This will slow down the printer a lot. The other problem is how you could make the 'standard' printer working, without the lower part, which is normaly the paper supply. (You don't want to move this part though your nicely moistened gips print..) So for now, the project is on hold, but not forgotten...
In the mean while, I found a nice instructable about dlp resin printers, let's try that first!!

I'm bought this nice setup, for being able, to make some small stuff myself. This HBM250 is a small lathe, but good enough to work with aluminum (& steel). The milling head is a BF16. That is actually very light machine. Ofcourse it's possible to mill some steel parts, but I still prefer aluminum. I also removed the BF16 from the lath and use a dedicated cross table. Whenever, I will buy a new milling machine, it will be a slightly bigger one.

Some time ago, when the FDM printing was quite new and prices of plastic filaments where high, I wanted to build a granulate FDM printing device. So I tried the extruder above. I used a K8000 USB breakout board. There are some libraries, so it could be connected to Visual Basic 6.
After finishing the mechanism & software, there were some issue's:
  • No experience with electronics, so I had some components burned out, again & again ;)
  • Granulate transportaion: the pitch rate was too high, so it was not really transporting the granulate. Also granulate could be easialy block in the inlet.
  • The electric motor (power 24Vdc) was way to small, especially during blockage of the inlet.
    So finally till today I have never been able to extrude a single stroke of melted granulate (snif)... Let's focus on other 3D printing techniques. (see above)

  • Aldi Microscoop

    Robot Wars

    Some handy PDF's