MakerGear Forum

Anyone know what this might be? Z stepper going bad maybe? Might do it 4 or 5 times then it's fine. No issues printing, no apparent binding.

https://www.youtube.com/watch?v=A8qj4d9 ... e=youtu.be

Thanks!

Does it do the same thing without the mic6 plate? It sounds like the motor is skipping and it's immediately when trying to raise the plate after a rapid drop. I'm wondering if it's the inertia of the plate causing or exacerbating this.

Hard to say, next time it does it I should take the plate off. I've been using the mic6 plate for nearly a year now, never an issue before.

That's definitely the z stepper missing steps. It might be binding slightly or something. I think you could probably patch it by just reducing the z axis acceleration, or the speed of that move in the start script. That particular move doesn't have to be THAT fast.

Make sure the Z screw is clean too. Sometimes it can get a thread wrapped up in there or a buildup of old grease. (I use an old toothbrush to clean that gunk out. it can cause sticking.)

Tell us more, did you mess with the firmware?

Haven't touched the firmware. Everything looks clean to me. I keep it regularly maintained and cleaned.

Here's my start script.

M204 T10000 ; increase default retraction acceleration
M201 X1200 Y800 Z500 ; reduce maximum acceleration to reduce ringing
G28 ; home all axes
G1 Y50 Z0.3 F9600 ; move forward to avoid binder clips
G1 X205 Z10 ; move off platform
G1 Z0.4 ; position nozzle
G92 E0 ; zero extruder
G1 E25 F225 ; purge nozzle
G92 E0 ; zero extruder
G1 X190 Z0.1 E1.0 F1200 ; slow wipe
G1 X180 Z0.25 ; lift