@dc42 : Ya, that was 50%, failed instantly, 60, 70... 100. Then I've realized that the problem is the same as I've had on X and Y: too much acceleration seen as stall. Didn't bother to put that back to a lower current because it works, but I've left the line there for others to tweak to their needs. On "M400", noted and added. Thanks!
@timcurtis67: I usually handle temperatures manually. Hotend is in slic3r, bed manually. This macro is done for when your hotend is already at temperature. The M302 P0 there for slow extrusion without stall detection is just as a precaution if you forgot to heat the extruder.
Maybe that part should also be under S1, I don't know. Put that on my printer today, based on a previous thread handled by @dc42.