pontus.h wrote: ↑
Jul 12, 2018 4:14 pm
So in general, "multi material
" means "different colours, single material
" and if not, there'll be lots of tweaking involved...?
Pretty much, yes. That's going to be the case with any "multimaterial" solution for 3D printing at the hobby level, even multiple extruder printers. I see no reason to expect that the Prusa unit will be much different. There's no magic bullet.
Again, this is based on my experience with the Palette+, which splices segments of filament together to give you multimaterial prints from a single extruder. The Prusa MMU is a different approach, but you're still going to struggle if the filaments aren't fusible or have to extrude at significantly different temperatures. Having multiple extruders makes it easier to extrude at different temperatures but doesn't eliminate the need to have compatible plastics, and multiple extruders gives you a whole new set of problems with registration and vertical alignment.
I don't want to be too discouraging. I've done soluble support (PVA + PLA) using my Palette, so it can be done. But it was not a push-the-button-and-make-it-go experience. I had to spend some time experimenting with the materials to find the right settings, and the results were not as consistent as I would have liked. Some of my problems were because the Palette still has some gremlins, and I'm hoping that the MMU will prove to be a better approach. But you just can't get around the fact that trying to build a single print that incorporates multiple different types of plastic is not a plug-and-play process.