I'm having a problem and I'm nearly at my wit's end.
When near Z=0 (within 2mm), some downward movements cause a 'thunk' sound.
I've been able to ascertain the following:
(0) It's a RepRapPro Mendel 3 Tricolour with 3 extruders installed.
(1) Using the Duet web interface, at Z=0.45 or Z=0.55, If I go Z+1 Z+1 Z+1, Z-1 Z-1 Z-1, the last Z-1 will usually result in a thunk sound.
(2) But doing Z+1 Z-1 or Z+1 Z+1 Z-1 Z-1 will *not* thunk.
(3) My father says he tried removing the threaded rods and flipping them upside-down, but the problem persists.
I'm having weird issues with my prints and I believe they're related to this. Does anyone have any idea what could be wrong?