Yeah, SuperLube https://www.amazon.com/Super-Lube-21030-Synthetic-Grease/dp/B000XBH9HI, being food grade safe was appealing, ingredients.
Any tips for removing gear from motor shaft when you’ve stripped the grub set screw 
?
I failed to make progress with the screw extractor, so leaning towards drill press, or angle grinder. I don’t want to just write off the entire motor, but it’s tempting when weighing up time spent.
I greatly appreciate the various community tips for dealing with the bolts, have compiled some notes/links in my first post, hope that helps future folks.
Man… The screw extractor helped for quite a few bolts, but, ended up using drill bit, force and patience to drill heads off a few stubborn bolts. Rubber band trick didn’t work for me. Awaiting delivery of some triangle bit heads to try out on the remaining motors, mainly out of curiosity.
In the mean time am screwing around with trying to control the motors using custom firmware loaded onto the 4.0 PCB, would be neat to repurpose the board for another project. Curious if anyone’s done something similar? I don’t need full FluidNC functionality, I just need to move the motors when a button is pressed, for now. I appreciate the open sourced PCB schematic, layout and forked fluidnc firmware are all shared to play with, thank you!
EDIT: 
, reading this gave me a much needed laugh…
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