For most FDM 3D printers, there is a small drive gear (feeding gear) to bite the filaments and clamp the filaments together with a bearing. The feeding gear has sharp teeth, which can bite the filament and push the filament back and forth by changing the direction of rotation. If the filament is jammed and the feeding gear still rotating, the filament will no longer be bitten by the feeding gear due to continuous grinding. [ 443 more words ]
