u/Ashamed-Food8178

Hey everyone,

I’m seriously stuck and could use some help before I throw this printer out the window.

I have a Creality K2 that just came back from a repair. The tech replaced the hotend board, wiring, and sensor. They also fixed issues with the CFS (damaged tubes at the entrance).

Since I got it back, my first layer is ALWAYS terrible — no matter what I try.

Here’s what’s happening:

• Lines look inconsistent and messy
• Poor adhesion in some areas
• Looks like the nozzle height is all over the place
• Some spots look too squished, others barely touching the bed

I’ve already tried:

• Re-running auto bed leveling
• Cleaning the build plate
• Adjusting Z-offset ( before i got it to the tech, no matter what i did the settings wouldnt saty)
• Different filaments
• Slowing down first layer

Nothing fixes it. It feels like something is fundamentally off since the repair.

At this point I’m wondering if:

• The Z offset isn’t being applied properly
• The sensor is miscalibrated
• Something is loose or misaligned from the repair
• Firmware/settings got messed up

Has anyone seen something like this after a repair? What would you check next?

I’ll attach a picture of the first layer — it’s consistently this bad.

Any help would be massively appreciated.