Marlin firmware fork for MakerFarm i3v w/ auto bed level & Roxy's enhancements

[AbuMaia]

I think the whole EEPROM thing is too much of a trouble-maker to be useful, IMO.

I've encountered a pitfall regarding running ABL before every print, however. I just replaced both my Z nuts, because the one on the RAMPS side either wore out, or the threaded rod did. It's only in one small area, however, which I believe is due to the constant up-down of the probing wearing that one section more than any other. The Z nut on the RAMPS side kept slipping down the threaded rod during ABL, throwing the whole alignment out of whack by nearly 2mm. No matter how much I hand-turned the Z rods to level them, the topographic map was always the same, or very close. The new Z nut is just a stopgap measure for now, until I can get new threaded rods.

If your rods, like mine, get black from oil and whatever other junk, look for one area that's shinier than the rest, around the point where your ABL probing happens. This is a sign that that spot is getting worn out quicker.

It seems that though I despise using the EEPROM, I may have to in order to avoid this excessive wear issue.

edit: Replacing the Z nuts did the trick:

Before (with hand-turning the Z rods in between each time):

Recv: Bed Height Topography:
Recv: Origin: Front Left
Recv: --0.99552 --0.58427 --0.10027 +0.40423 +0.91598
Recv: --0.96627 --0.53202 --0.05352 +0.45073 +0.95223
Recv: --0.94152 --0.50377 --0.01652 +0.51248 +1.00023
Recv: --0.92702 --0.47602 --0.01177 +0.54798 +1.04023
Recv: --0.91602 --0.45577 +0.01198 +0.56598 +1.07823

Recv: Bed Height Topography:
Recv: Origin: Front Left
Recv: --0.98843 --0.57268 --0.10043 +0.40732 +0.96382
Recv: --0.96243 --0.53468 --0.05293 +0.43907 +0.95182
Recv: --0.92243 --0.50643 --0.02218 +0.48957 +0.98982
Recv: --0.91618 --0.47068 --0.00618 +0.55457 +1.03332
Recv: --0.93643 --0.47818 +0.00357 +0.55457 +1.08282

Recv: Bed Height Topography:
Recv: Origin: Front Left
Recv: --0.98989 --0.57314 --0.11264 +0.40236 +0.94361
Recv: --0.96639 --0.53439 --0.06864 +0.43836 +1.01611
Recv: --0.94014 --0.50789 --0.02189 +0.47636 +1.04811
Recv: --0.92014 --0.48814 --0.00989 +0.50836 +1.09411
Recv: --0.94389 --0.48214 +0.00211 +0.52486 +1.10486

Recv: Bed Height Topography:
Recv: Origin: Front Left
Recv: --0.98813 --0.57938 --0.10138 +0.41412 +0.93487
Recv: --0.95538 --0.53113 --0.05763 +0.46062 +0.99837
Recv: --0.92613 --0.51163 --0.01738 +0.49237 +1.06087
Recv: --0.91513 --0.48213 --0.01138 +0.52462 +1.06912
Recv: --0.95738 --0.50538 --0.01913 +0.51512 +1.08862

After:

Recv: Bed Height Topography:
Recv: Origin: Front Left
Recv: --0.22164 --0.12064 --0.03789 +0.01611 +0.06361
Recv: --0.19539 --0.08789 +0.00186 +0.05711 +0.11011
Recv: --0.17564 --0.06214 +0.04186 +0.09611 +0.12236
Recv: --0.14789 --0.03514 +0.07536 +0.13861 +0.18036
Recv: --0.17814 --0.03839 +0.07011 +0.14111 +0.18611