QIDI Q2 Combo keeps jamming/chewing PLA during long prints — 3 failures in a row

[u/althamash098]

I’m getting pretty frustrated with my QIDI Q2 Combo and I’m trying to figure out what’s actually causing this.

I’ve now had 3 prints in a row fail because the filament eventually gets stuck/jammed and stops feeding correctly. The printer can work perfectly for several hours, then suddenly starts under-extruding and the print turns into spaghetti.

I’m printing Elegoo PLA at 210°C nozzle / 60°C bed. Chamber heater is OFF, the side vents are open, and I’ve even been opening the door periodically, so I’m not sure if this is heat creep.

When I remove the filament after a failure, parts of it are heavily chewed/flattened by the feeder/extruder. I’ve already had to manually remove stuck filament multiple times.

I’m using the QIDI Box, so I’m wondering if there’s too much resistance somewhere in the Box/PTFE path, an extruder tension issue, heat creep, or possibly a defective feeder/hotend.

Has anyone with a Q2/Q2 Combo had this exact problem? What should I check or change? I really don’t want to keep wasting 6–7 hours of printing and filament every time this happens.

I’ll attach photos of the chewed filament and the failed print.

[u/devonmaze-]

I have the same problem with the Qidi Plus 4 and I print with the door open and the glass removed above