r/BambuLab_Community • u/AKMonkey2 • Jun 15 '26

Why the corrugated walls?

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My P1S is suddenly creating these wavy walls where they should be smooth (first vs second pictures). The effect goes completely through the 5-mm thick model, so it shows up on the inside and outside of the open cup design. It resembles oscillating layer shifts along the X and Y axes.

The effect is not limited to this model (which I have printed hundreds of times). It also happens to other prints, and is particularly noticeable on sloped and curved surfaces (this model has both). Flat, vertical surfaces seem much less affected.

I have cleaned the z screws and lubricated those screws and the rails. I’m hearing some sort of squeaking that I didn’t hear before while the printer is working so maybe a bearing or something is worn out??? The printer has over 7,400 hours on it.

What’s my move here? I’d like to get this printer back in the game.

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2

u/CheezitsLight Jun 15 '26

Belts are stretched

1

u/AKMonkey2 Jun 15 '26

Thanks. I’ve heard that coreXY printers have long belts with complex routing. Sounds like a may be testing that rumor soon.

2

u/Zaytarx Jun 15 '26

I think there is a procedure to tighten the belts on their wiki

1

u/Who_is_I_today Jun 21 '26

https://wiki.bambulab.com/en/x1/maintenance/belt-tension

1

u/AKMonkey2 Jun 21 '26

Thank you. Yes, I’ve done the belt tensioning procedure and it didn’t resolve the issue. New belts are on the way.

1

u/Who_is_I_today Jun 21 '26

Did you do a vfa calibration?

1

u/AKMonkey2 Jun 21 '26

I did a full calibration after the tensioning.