We need to start to fill up lemmy :) Can you solve this issue?

My HEVO (Hypercube Evolution), now 5 years old started to have very weird banding.

It has a Bowden BMG Extruder and a E3D V6 printhead with CHT-Nozzle. MKS Robin with TMC2209 and Klipper.

Benchy is ABS, lower one is HIPS. Printed at 230°/105° bed. part cooling fan off.

I took apart and cleaned the extruder. The gears look intact and i can move the extruder by hand without binding. I found the E3D V6 was loose. I retightened it, which didn't solve the issue.

I'll spend a beer to the one that solves this issue ;)

Edit: Found the Issue: hotend not hot enough.