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:
The 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:
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.
I modified the DRV8825 driver PCBs for fast decay mode:
Then set the current to a bit over 1 A:
Six hours later I hauled the once-again-functional CNC 3018XL to my presentation for the ACM:
Memo to Self: Time to get another Prontoneer board …
The Smell of Molten Projects in the Morning 
PHew! Just in time. Good luck with your presentation, Ed!
Definitely a nail-biter through Monday morning …