Hello All-
My MPCNC has worked flawlessly for about a year now. I’d like to add an extruder to see how well it works as a 3d printer and hoping to get some advice on what needs to be done to make it work…
Im using a Rambo v1.3 and I do not have dual endstops setup. I plan on increasing the hight of the outer posts and the Z rails to increase the possible build height. Right now its pretty low for stability.
Looks like fans, extruder, and heated bed will all plug into the Rambo- correct?
I guess I can’t do endstops on X and Y, but what about Z?
Any advice would be greatly appreciated!
Hi,
I have a MPCNC rigged for 3d printing using 3mm filament. It produces a pretty good result, but not as good as my MP3DP’s.
The main problem is the acceleration and jerking causing shaking. I have to lower the speed to keep the shaking down. The taller the rig the more wobble you can expect, so would expect bracing of the frame would help. The inertia of the Z axis limits speeds. The bed size worked out to 530mm x 220mm and I plan to use 3 heater beds, under glass, although I only have one heater bed in use at present.
It was originally a plain CNC, but after I built a stainless steel tube CNC, had it lying around so thought I could try it as a printer. An old ex PC psu 350W does the necessary.
I use the Marlin for MP3DP and fitted end stops to all axis. If the hot end nozzle is the highest tool level when the Z stop is set, the spindles would have lower tool points then you could use the same Marlin for 3dp and cnc. It’s the Gcode which calls for the ‘0’ setting of the axis. ( I hope I make myself clear!)
Ryan uses (or used) a 4 head MPCNC and he states the results were amazing.
Good luck,
You can do endstops but the accuracy is not as good without dual endstops, or careful setup before you hit “go”.
It prints great if you can handle lower speed. Just remember it is probably 20X more massive than a 3D printer, I am happy that it does not need to print 20X slower. I was printing great at 25-30mm/s and I print at 35-38 on my printers. so for me it is not a huge issue.
I needed to print with my MPCNC yesterday and tried to remove the shake. I had set acceleration to 0 before thinking it would be the slowest setting, but I was wrong. I think it removes acceleration control completely before . I set it to 100 and the shake went!
I can sometimes get 3mm filament for 9$/kg which was the real reason for adapting the MPCNC.