Delta Printer aprubtly starts moving "weird" (Duet 0.6)

Hi.
I recently built my own delta robot. I mostly used dc_42s Blog as a guide... It works well.. up to a point.
Sometimes (more often in recent times) it starts moving strange. It seems like it uses way more steps for one stepper (the "Z" stepper - also you cant really call it that on a delta robot) than for the others... It happens often after turning it on, but also mid print sometimes.
Has anybody ever seen something like that?

Sounds like an intermittent connection on the micro-stepping settings. Are you using old school electronics with jumpers or a newer board with software control of the microstepping?

Its a Duet v0.6 microstepping cant be controlled by software afaik

One thing i noticed: It either happens directly after startup, or in the first 1-2 layers... never happened afterwards.

Edited 1 time(s). Last edit at 02/14/2016 09:25AM by Karatektus.

Check all the wires, and examine the control board for shorts or other damage.

Seems to be a cold solder joint at the z-stepper driver. After warming up the driver chip ( 1-2 layers ) the error is gone.

Quote
o_lampe
Seems to be a cold solder joint at the z-stepper driver. After warming up the driver chip ( 1-2 layers ) the error is gone.

That sounds reasonable.. I'll take a closer look at that!