Thanks.

- Filament was ALWAYS breaking and getting crumpled up in the hotends.
I fixed this by building a pipe from the hotend to the base. There was too much play.

- Keeping the nozzles level is now the biggest trick. Setting it once, easy enough. But I need
something slightly faster, accurate and repeatable. Now I shove a shim, tighten, move to bed,
measure, move back up and repeat until close.

- I've got mesh bed leveling working and setup up BED Z and he other parameters.
I fixed that by just turning on SAFE_HOMING. A G28 uses the probe. But, when almost anything
happens, MBL is turned off again. M502: G29 S1: G29 S2: M500 sets it on.
(But the Z axis isn't rotating like it should... Which is OK. The bed is level to .15 anyway.)

- I went to 24V it just took way too long to heat up the bed. (Had to adjust PID and PWM rates
so extruders don't burn out prematurely.) All fans get PWM modified to run at half current or so.

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I'm back to the point where I can use the printer again.

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Next I'll fix ABL...