Thanks Steve! I haven’t run into a problem with steppers turning off yet, (I think using Pause in Repetier has something to do with that, but I’m not sure…) but now I know I can prevent it for certain with M84 S0. That’s going into the start code! I haven’t personally tried any of the SD/LCD pause codes, but I’m going to tag this in case I add those later.
Some might like M226 Pnnn Snnn in Marlin, wait for Pin State, P is pin number, S is state. For some reason, the RepRapWiki recommends M226 over M25, but if it works, it works!
I really liked the bit insertion depth guide from your linked page – it could probably get me out of my Z height uncertainty!
Time to try some Fusion360….