A typical Flashforge print before adding a part cooling fan, with slicer optimization the results are dramatic!
A print that dislodges from the bed can create a "meatball" of extruded filament, that's what happened to this Einstart S.
A poorly aligned dual-nozzle FlashForge Pro, before and after calibration. The outside should be a single aligned part.
If the nuts for manual levelling are loose you cannot level the bed. Blue Loctite secures the bolt permanently.
Sometimes an unloading mishap occurs requiring the dismantling of the extruder to remove filament blocking extrusion.
An improperly installed or configured hotend can create all kinds of issues with clogging.
On a tethered machine there is a risk of damaging connectors; on this Lulzbot Mini we replaced the USB jack with a new part.
The right thermistor required replacement when it was damaged removing a failed job from a cold FlashForge Pro.
Prints can fail for all kinds of reasons, in this case the slicer was poorly configured, causing the dragging of hot material.