Alright, so I finished building my 3D printer (ultimaker 2 clone from aluminium extrusions). and whatever I change in the marlin settings, the speed of my Z axis is really weird as the bed comes up after hitting the home switch. It starts out accelerating really fast, then it abruptly slows down to around 10mm/s and at 40mm from the top it starts a kind of shocking movement. I’ve tried fiddling with the acceleration and mmax speeds in marlin but it won’t change. The extruder also kinda does this when I make the retraction speed higher. is there anyone that has experienced this as well?
SOC3D
2
It might help to post your configuration (summary) for others to look for specific problems.
Xasin
3
That sounds a lot like loosing steps.
If the stepper motor sounds change from a smooth, nice tone to a sudden loud, metallic and uncomfortable buzz, then it’s that your stepper motors are being driven so fast that they loose speeds.
I’m actually surprised that your Z-Axis goes up to 10mm/s, since mine (with a normal threaded rod for screws) gets up to 3mm/s
I’d set the max speed at around 5mm/s, you don’t need it that fast during prints anyways, and I’d also set the homing speed to a reasonable value of around 4mm/s or so.
