Raspberry Pi calculations replace mechanical engineering on 3D printer

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Standard 3D printers require significant mechanical structure to provide movement on the three axes. This alternative design uses radial arms with a minimum of …



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18 thoughts on “Raspberry Pi calculations replace mechanical engineering on 3D printer

  1. one assumes that a radial function would be present to compensate for this, after all the same calculations are taking place on the other two axes. The location of the nozzlehead is known at all times from the fixed pivots and the length of travel on the Z-axis in much the same way as the location of nozzlehead on the build area is known from the 2 radial axes.

  2. I'm not sure I understand the rationale behind this. The motors are controlled by the ATMega. Couldn't you have just pre-translated the coordinates on the PC and sent em directly to the ATMel? Or, if I wanted direct control via a Pi I would have just put drivers on the output pins. Maybe run the motors via a stepper controller like the LM297/298. Not only would you get control, you'd also get load sensing from the 298.

  3. i really hope this advances further than a proof of concept, i have wanted a 3d printer for a while, and am considering building one myself, but an lcd+ usb for most printers is a 170$+ add on, with this, i could just hook up a keyboard and use an old crt shaving off a significant portion of the cost. i am definitely subbing and await any further work with this.

  4. Loving it!!! Now that's someone using his head instead of bruteforcing some other designs! I love the fact that it solves some issues by using a "non-conventional" coordinate system

  5. If you want to get started, my suggestion is: look inside any old printers and scanners and find a couple of unipolar stepper motors (the ones with 5 or 6 wires). Get a gertboard and wire up a stepper to the open-collector drives. The motors are likely to work at 6 volts – not much torque is needed for this design. Install wiringpi and drive the four stepper coils to get the motor rotating. Look on e-bay for plastic rack and pinion bits and make up one of the arms. You would be nearly there.

  6. This is a 'proof of concept' implementation which I made without any prepared plans. A great thing about it is that you can put the two motors and the third pivot point in a rough triangle to suit the scale of your ideas and then put a suitable platform in the middle with three arms that are long enough to move the platform. Then measure what you have done and transfer the values into the code. The code is a bit messy at the moment but I could let you have a copy if you it would help.

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