Check these first
- Partial clog: do a cold pull. Our 3D Clean purging filament also helps.
- Speed over the melt limit: on a 0.4 mm nozzle, keep max volumetric speed around 10 mm³/s (6–8 for CF10 and GF10). Larger nozzles may go higher; calibrate to find the limit.
- Friction in the filament path: long PTFE runs, tight bends, dryers feeding the printer directly, or a spool that drags. A jerky, uneven feed can starve the extruder and make it grind.
- Extruder tension: if the gears slip and leave marks without grinding through, check extruder tension and gear condition.
- Heat creep: very slow printing, ironing, or high chamber temperatures can soften filament above the hotend. Keep chamber heat around 45°C or lower, and off when printing PLA supports.
- Toolhead alignment: filament pushing out of the extruder cap points to a printer hardware issue.
PLA and Pro PCTG through the same nozzle
Don't do it, though jams aren't the problem. Pro PCTG is much more viscous than PLA, so it punches through leftover PLA in the nozzle and comes out coated in a thin PLA skin. That skin keeps layers from bonding, so parts come out weak. See Supports and PLA breakaway interfaces.
Spool problems
If the filament binds on the spool, has bumps or debris, or the spool itself is damaged, contact us with a photo of the spool label (it has the lot number) and we'll make it right.
Still stuck? Contact our support team with photos, your printer and nozzle, your slicer, and any changes you made to our profile. A project file (.3mf) helps most.
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