Is anybody using this design for his 3d printer?
Polar printers really never took off the ground. I tried to design on a year or so back and the dev just isn’t there to justify it. Doesn’t really do anything better than Cartesian in my opinion.
In my opinion they should make sense with a double circular system for y-x axes as It would simplfy greatly mechanics and would need a single rail for z axis.
There are viable polar printers out there (eg http://www.polar3d.com/) but spinning the bed introduces firmware challenges. (What happens to the bed rotation angle when the nozzle has to cross the center of the bed at some speed?) There’s also a cap on how big you can make the bed before you run into problems with either resolution near the edges of the bed, or speed near the center of the bed.
Basically there are some minor advantages over Cartesian, but also non-trivial engineering challenges to overcome.
http://www.polar3d.com/#whypolar