Title says the idea, but is it possible?
Got me thinking cause I only use my MPCNC for 3d printing and its mechanical nature is beginning to show. Its weight is putting it back from printing as fast or as tall as the lighter weight prusas can. I know about the MP3DP, but that takes away the build volume the mpcnc has.
I was thinking of modifying my mpcnc by transforming it into a classic cartesian style printer where the z axis is incoperated on the build plate itself and slowly descends as the print sticks. This allows the gantry to be much lighter without the weight of 2 sets of z axis pipes, a stepper, and other hardware. I may even try to modify the gantry to not include the z bearings for even more weight reduction. I realize it is still heavier than most 3d printers, but that would help. Also, without a z axis on the gantry, the rigidity reduction caused by the positioning of the extruder would be completely gone, since the extruder can be placed right where the rails meet.
With these changes, I can keep the big xy I like, but increase my z and my print speed a little.
Is this a good idea?