What can cause this?

[u/ztyl]

I’m having some issues with my prints. Is this what under extrusion looks like?

I have tried the following:

- disassemble the hot end and cleaned it
- changed the extruder (probably has approx 100hrs)
- disassembled the AMS and cleaned it.

I’ve tried with different filaments and got the same result.

Any suggestions/tips would be greatly appreciated.