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Polar 3d Printer

by Torleif, published

Polar 3d Printer by Torleif Oct 15, 2012



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Mockup 3D printer based on SCARA type robotarm

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No results.

Won't function very well due to gimbal lock at the origin.

Did you ever get anywhere with this design?

No, to few benefits for the added complexity.

Have you thought about using a circular print platform to utilize the arm's full range of motion?

Shure, Thats a totally valid point. This is just a mockup for inspiration. I just don't think it looks right.

I am currently building a repstrap on a similar principle, driven from a shaft within a pipe.  The big challenge would be to get rid of play in the mechanism, and to get high enough resolution in the outer edges of the build area.

When I was thinking about this, I looked at two stacked turntables with the extruder moving up and down. The turntable bearings can be printed, either tapered roller style, or sliding bearings. I was able to make both types turn reliably with me standing on them!

Ah interesting. In pursuit of speed and acceleration  I'm ready to sacrifice a lot of strength and simplicity to explore the lightest possible motion system. 

Interesting idea however the filament feed would need to be looked at as the joint for the arm is concentric with the output arm. Additional spacing would be required to extend the hotend from the arm nadding more complexity to the kinematics.

Oh i have something in mind for that.  Thinner filament is more flexible and can be feed sideways into the hotchamer. If the hotend rotates freely in a bearing it orients with least resistance to a bowdencable. With a simple coaxial drive both motors can be stationary.  

good point.. but i would take advantage from that last rotating axis on the hotend. you could have a special nozzledesign always pointing back the printpath.
This is what i mean:

Sure but down that route of complexity you will need a far more advanced slicer. might as well go full like five or six axis cnc and get supreme control of surface an finnish.