Mastering 3D Printing in the Classroom, Library, and Lab by Joan Horvath & Rich Cameron

Author:Joan Horvath & Rich Cameron
Language: eng
Format: epub
ISBN: 9781484235010
Publisher: Apress

Backing Out of a Bad Situation

If you forget to take a previous print off the platform, or otherwise do something you are not supposed to do, you may find the extruder jammed into a print or blocked somehow. Because it is hard to figure out which way is +x and which way is –y under battle conditions, you might want to familiarize yourself now with how your printer is set up in case you need to walk your way out of a problem with the manual controls.

Extruder Not Extruding

If the extruder is moving around but no material is coming out, there are a few possible problems. The extruder nozzle might be jammed, or the extruder motor might not be pushing out filament. To debug this problem, you may have to trick the printer a little to get the information you need.

Most printers are set up so that the drive system does not try to push filament through a cold extruder. However, for printers with a visible filament drive gear, it is helpful to see whether the gears are turning even though nothing is coming out. A drive gear and its relationship to filament are shown in Figure 5-4. You may not be able to see anything if filament is stuck in the nozzle. But if no filament is in the extruder drive, you might be able to send an M302 G-code command to the printer to tell it to override the need to heat up the extruder. Then tell the gear to extrude a few tens of millimeters of filament. See if the gears are turning. If not, you have some other failure.

Figure 5-4A visible (Bowden extruder) filament drive gear

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