Continued layer shift issues
Despite doing all the fixes found in forums I’m still having layer shift problems.
but only in very specific situations. Otherwise this printer produces the best prints I’ve ever done.
Layer shifts are only in circular or curved objects. (print same objects but converted to flat sides - perfect print.
Only occur when doing multiples of the object - print same objects one at a time -perfect prints
( but if do a single object with two towers - shifts in the towers but never in the single object part of the body of the object )
Background:
kit assembled, only about three weeks old latest software etc
mmu3 now attached and works great in normal situation - but layer shifts occurred in both with and without ( pre and post adding the mmu3 and also if I print multi or single colour or disable the mmu3.
belt tension appears correct using to tensioning app,
gantry frame absolutely square ( I went to measures to square it at time of build and then again when trying to fix layer shifts)
Avoid crossing perimeters disabled,
shifts are in the x axis occurs with any filament.
when shifts occur - shifts always in same direction and usually about a half or third of the diameter of the object and usually multiple steps. Doesn’t ever jump back toward original object position.
originally seemed to be at any layer but last few times seems to be near end of print.
given that it’s only in specific situations and others are absolutely perfect prints I get the feeling ( maybe I’m wrong here) that the mechanical situation is ok and that its software related to the specific object shapes.
RE:
Most likely it's the print head getting stuck somewhere.
- Does it correlate with using the back left corner of the print bed? => umbilical getting jammed between head and X-axis motor. See "chopstick mod" or other similar threads on the web.
- Head getting stuck on the wipe tower but you said it fails also in single-color prints
- Overextrusion
Are you sure shifts are "X axis" only, not diagonal? That would mean both motors skip the same number of steps. Which seems unlikely, unless running into a "precise", hard obstacle like the end stops.