Resume on Pause causes extruder to jam
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I have tried to use the Pause on Layer feature, or just Pause button during a print, so that I could switch filament colors.
In both cases, the printer seems to do a few odd things. Sometimes it will reverse the extruder stepper to unload the filament while it's moving back to the print, other times, it will extrude faster than the nozzle can handle, causing large blobs out the extruder and I can hear the tension bearing and hobbed gear popping against the filament. In some cases, it grinds away at the filament enough that it jams. When I extract the filament, I can see that it's chewed halfway through on about an inch worth of filament. Makerbot Desktop didn't do this to me, but it's inflexible for a lot of other things.
I have a Makerbot Replicator 2 and a Windows 10 64 bit machine. I have Matter control 1.7.5
Why is this happening? what can I do to correct it?
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What is in your Pause G-Code and Resume G-Code? Are you doing any extrusion or retraction while paused?
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They're at default AFAIK. Pause says G0 X0 Y0 ;set warming position
Resume says "@restore_xyz_position
@restore_e_position"
On pause, it actually goes to the opposite corner from "home".
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I've tried swapping filament several ways. the first was to Z up about 30mm then manually swap the filament without sending any commands to extrude/retract. Just push the lever down, pull filament out and push new in. BUt sometimes that causes a jam. So I tried to Extrude+. But then it does Retract nonstop until I power cycle the printer.
I enabled Print Recovery and tried again. When it started the odd extrude behavior on pause, I power cycled the printer and told the software to recover the print. But it does weird random movements (went to home, went to opposite corner, sat forever.. moved to various places above the print area but didn't extrude anything... sat there a while, moved again..and doesn't actually print anything.
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If I blank out the pause and resume boxes, it stops directly on top of the print. If I Z+ and manually replace filament, when it resumes, it drops down onto the print and extrudes a large blob before resuming the print. If I place a disposable feature (Extra, small part) off to the side and move it around until it's the last part when it pauses, I'm able to remove the blob and part.. but then when it returns to that area, it extrudes material that sticks to the extruder tip and gets deposited later on when it returns to the normal part...