Hey all, hoping someone can help me troubleshoot this. I have a Creality K1 (Jan 2025 batch), and it’s been solid for 200–250 prints so far. After a 2-week pause, I powered it back on and now I’m getting **severe under-extrusion** out of nowhere.

What’s weird is:

* It was working perfectly before the break
* I’ve tested multiple eSUN filaments: wet, dried, overdried, and even a freshly opened new spool (PLA+)
* Same result every time
* I replaced both the **hotend and nozzle** about a month ago, barely used them since, and they were giving great prints right after
* Prints still finish, but any overhangs or diagonals (>30°) fail badly — **holes, poor adhesion, zero strength**

I’ve also tried increasing flow rate during printing from 100% to 120% in steps (via the screen). That just makes the lines fatter/taller, but they **don’t fuse** — same poor inter-layer bonding. I tested bed temps from 45 °C to 60 °C (PLA/PLA+ range), no real change.

I suspect the extruder isn’t pushing enough filament, but I have the **newer version with the white collar on the PTFE tube**, so it seems early for the extruder gear or motor to be failing. Could something still be slipping or grinding under load?

Any ideas? Should I already consider replacing the extruder motor or gear? Appreciate any thoughts 🙏

Sudden severe under-extrusion on Creality K1, new filament & new nozzle doesn’t help