Hey all,
Built my first reprap, it's a p3 steel using RUMBA control board with Marlin firmware, and a reprap_discount full graphic controller on the side.
The printer seems to work fine if I operate it using the LCD controller (all axis jog without any issue). The problem is when I try to operate the printer using the computer. I'm using the control panel on Simplify3D to control it. Jog commands for x-axis and y-axis work perfectly. So does the Home All command. However if I try to jog the Z-axis separately, then it seems as if the Z-axis motors are jammed or something. They make a loud whining sound and move only a quarter of the revolution it should be making.
I experimented with 115200 and 250000 baud rates. Didn't make a difference. I have no clue what the problem might be.
I really hope someone can point me in the right direction on this.
Regards!