It is necessary to keep the extruder gears clean, in order to avoid printing issues
After some hours of printing, or if you have experienced under extrusion issues, it’s possible that there are rests of filament on the bondtech gears, which could cause issues when loading filament or printing.
If you have an air compressor, compressed air can or a soft brush you can clean the bondtech extruders externally.
If you need to do an in depth cleaning of the bondtech extruders, disassemble these, and then proceed with the cleaning and reassembly, as explained in this video.
If you are not able to unload the filament, check this article:
This article doesn't fix your issue? Check out our forum community for more info about this
It's important to keep your printer in good shape to make the most out of it. In this chart you can find a list of the extruder maintenance procedures and how frequently these should be done. Maintenance Plan
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