If the truth be known, I wanted to do this as soon as I discovered the
CAMtool V3.3 board hardwired the DRV8825 PCBs in 1:32 microstep mode:
CNC 3018XL – Protoneer atop Arduino – installed
Protoneer CNC board has jumpers, so selecting 1:8 microstep mode is no big deal.
As before, I epoxied another row of pins along the I/O header for Makerbot-style endstops:
Protoneer endstop power mod
I’ll probably regret not adding pins along the entire row, but, unlike the MPCNC, the CNC 3018XL won’t ever have
hard limit switches. I plugged the Run-Hold switch LEDs into an unused +5 V pin and moved on.
modified the DRV8825 driver PCBs for fast decay mode:
DRV8825 PCB – Fast Decay Mode wire
set the current to a bit over 1 A:
3018XL – Protoneer setup – Z 1 mm
Six hours later I hauled the once-again-functional CNC 3018XL to my
presentation for the ACM:
Spirograph – intricate sample plot – detail
Memo to Self: Time to get another Prontoneer board …