Recently, I have been studying CoreXY builds. My longer term goal is to build one, and while it is clear to me that this will include some trial and error, I hope to learn as much as possible from others. Right now, I don't have the time to start and thus keep reading and thinking ;-)
Reading through digital dentist's blogspot pages, in particular the ones about the "UMMD" printer, I wondered about a few points
Reading through digital dentist's blogspot pages, in particular the ones about the "UMMD" printer, I wondered about a few points
- Z axis
As far as I see, there are two linear rails for the belt-driven Z axis. Isn't there a problem with their alignment and binding, in particular in combination with thermal expansion? Maybe I missed a design feature? - Extruder carriage length
I first did not understand why the extruder carriage needed to be that long, but then realized that this was because the XY assembly was sitting on top of the frame and had to "reach down" to the print bed, across the T-slot profiles, linear rails, and build plates. Couldn't this be avoided by mounting the XY assembly "upside down", i.e. hanging from the frame rather than sitting on top of it? Or are there reasons not to do this? I imagine that it might be less practical for servicing, but maybe there also are other reasons? - Belt-driven vs. lead screw-driven Z axis
I read that one reason for the belt solution was to avoid ringing from possibly not fully linear long lead screws. On the other hand, the belt solution also is not that simple, with the worm gear providing the transmission ratio that the lead screw would otherwise. How critical is such "ringing", and does it matter in practice, in particular in designs that have a shorter usable Z height?