Printing with delta printer isn't working, very jittery.

CheetoJuice

Hi everyone,

I've been building a delta printer from scratch using the Mega/RAMPS 1.4 platform. I can control and home the printer without any issues using the manual controls in Repetier-Host—it moves accurately and smoothly across all three axes.

However, I run into a problem when I try to print something.

I upload an .stl file to Repetier-Host, slice it, and everything appears normal—the print path is displayed correctly, and the estimated print time looks reasonable. Since I haven't built the extruder yet, I select 'Dry Print' mode to simulate the movement. When I start the print, the printer homes itself and moves to the starting position, but then, depending on the slicer I used, it either stops completely or moves in small, jittery steps. Either way, it doesn’t move as it should.

The strangest part is that the UI shows the print progressing extremely fast, as if it’s completing a one-hour print in under a minute, even though the platform is barely moving.

I’m not sure if this is a firmware issue or if I’ve misconfigured something in Repetier-Host. Any help would be greatly appreciated!

Thanks in advance!

Repetier

Check if speed multiplier in host is 100% (default) if not it could explain the speed.

Also disable easy mode so you see log and check if there are communication errors. When buffer size is set too high you get man errors cauing start/stop often.