Questions & Answers
G32 returns different Printer height than measured height
Questions & Answers
Hello, I physically measured my extruder to bed height using a ruler (163.07 mm). When I run a G32 command it returns 194.08 mm. Why? I'm currently setting up Z probe and just want to make sure I have the numbers right before I start.
Assuming you use repetier-firmware as this is firmware related, it will measure distances and also add z probe height to the measured distance (distance nozzle -bed when z probe triggers) and it subtracts bed coating. Also a wrong value for z steps per mm can lead to a wrong height. So please also test if moving z 100mm moves it 100mm or less. With such a big difference one of these must be set wrong.
This is my G32 result. I'm not sure what it is telling me. Does it seem right? My extruder height is 163.07 and G32 returns 163.340, should i change the Z height in the EEprom?
00:18:31.493 : N114 G32*28
00:18:31.493 : Z correction disabled
00:18:31.493 : Info:Autoleveling disabled
00:18:33.435 : SelectExtruder:0
00:18:33.435 : X:0.00 Y:0.00 Z:163.370 E:0.0000
00:18:42.251 : Z-probe:11.37 X:-45.00 Y:-45.00
00:18:46.968 : Z-probe:11.06 X:45.00 Y:-45.00
00:18:51.744 : Z-probe:11.95 X:0.00 Y:45.00
00:18:52.214 : plane: a = -0.0034 b = 0.0082 c = 11.5825
00:18:52.214 : Transformation matrix: 0.999994 0.000000 0.003445 0.000028 0.999967 -0.008166 -0.003445 0.008166 0.999961
00:18:52.224 : CurrentZ:12.10 atZ:12.13
00:18:52.224 : Z after rotation:12.13
00:18:52.224 : Printer height:163.34
00:18:53.055 : Info:Autoleveling enabled
00:18:53.055 : X:0.04 Y:44.90 Z:12.467 E:0.0000
00:18:53.065 : Info:Autoleveling disabled
00:18:59.314 : SelectExtruder:0
00:18:59.321 : X:0.00 Y:0.00 Z:163.340 E:0.0000
00:18:59.321 : Info:Autoleveling enabled
This result will put nozzle around 0.3mm deeper into the bed for z=0 but now also includes bed leveling results. So it might be good or 0.3 too much. You have to check best with a paper sheet where you end up at z=0. If it has too much force you need to change in eeprom so z height decreases after G32. In general it looks like suppoesed, but result can not be told remotely. So it is just a matter of finding right z probe height for eeprom to make it work exactly and repeatable.