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Printrbot Talk Forum • View topic - Extruder digging into print bed

Extruder digging into print bed

Need help troubleshooting hardware issues... talk here

Extruder digging into print bed

Postby butool » 2019-Jan-Thu-18-Jan

I recently removed the extruder on my PrintrBot simple metal plus (the old one) to clean out a clog. When I reinstalled it I tried a test print. The homing sequence goes fine but as soon as the perimeter print starts the extruder head digs into the print bed. Does anyone know the cause and/or solution for this problem?

Any help would be much appreciated
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Extruder digging into print bed

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Re: Extruder digging into print bed

Postby RetireeJay » 2019-Jan-Thu-21-Jan

One possibility is if you have an incorrect Z offset somewhere. The probe sequence tells the machine the Z position where the probe switches state, but then there has to be a correction to get the nozzle to the exact right height. Either the exact physical position of the probe has to be adjusted mechanically, or there has to be an adjustment somewhere in software. I never had a Printrbot with a probe, so I'm not sure how the adjustment is done, but I wouldn't be surprised if there are setting both on the Printrboard (in EEPROM) and also in the slicer that calibrate this offset between probe-switching height and optimal nozzle height. If you have either changed the nozzle or loosened and re-set the probe, you have to adjust this calibration because the offset between the two has changed.
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Printrbot Plus operational January 2013
Brass threaded rods (5/16" X 18) & nuts for Z axis
GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
Have used many pounds of T-Glase filament. Now also doing some work with Ninjaflex SemiFlex
Print on glass with Scotch Craft Stick or other glue stick
"My next printer is..." Prusa i3 MK3, upgraded to MK3S
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Re: Extruder digging into print bed

Postby novice » 2019-Feb-Fri-06-Feb

M212 Z0.10
M500
M501

Value shown will raise hot end .10 mm, the greater the value for M212 the higher the hot end. To lower a too high hot end, one would use a negative value as example M212 Z-0.10

M500 stores new value to memory
M501 confirms new value
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Re: Extruder digging into print bed

Postby ktfergus » 2019-Feb-Fri-13-Feb

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PrintrBot Model: 1403 (Simple Metal Assembled) ::
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