Has anyone tried (or seen anyone try) to "circularly-spin" a printing table beneath a

polar printer would possibly work ok for printing round things with concentric fill, but wouldn’t be able to draw a straight line close to the origin at a constant speed due to the insane accelerations that the table would have to go through. Also, the precision at the outer edge of the table would be abysmal.

This type of printer would therefore be significantly limited compared to a cartesian or delta- you could only print certain types of objects on it, whereas cartesian and delta printers can print these objects fine as well as a whole host of others.

Good point @Triffid_Hunter , it would be really interesting to see some actual output from this device.

Seems to me that the ideal input for this printer would be its own (scanning) output, and would best be served by a software stack that was designed from the outset for that purpose.

Coincidentally, I’m reading “A History of RepRap Development” and ran across this from the first blog post in 2005:

“The vast majority of existing rapid prototyping machines work using Cartesian X, Y, Z coordinate axes. This is an obvious way to do things, but we think that it may be better to make a polar machine that has a radial arm, a turntable, and movement along the axis of the turntable.”