SOS: Repeatable Print Defect Only in One Area After Nozzle Swap – P1S Help Needed
Printer: Bambu Labs P1S + AMS Combo Issue: Repeatable wipe/scar on part surface – always in same spot on the part, regardless of model orientation or bed location Started after: Nozzle change to JUUPINE All-in-one Fully Assembled P1/P1P Dedicated Hot End with Cooling Fan for Bambu Lab P1/P1P 3D Printer, Including Thermistor, Ceramic Heater, 0.4mm Hardened Steel Nozzle and a Heating Block. Slicer: Bambu Studio
Problem Description:
I’m getting a consistent surface defect around layer 27–32 that looks like the nozzle is either dragging or under-extruding on one edge of the part.
Happens on every print, same Z-height, and always on the same side of the part, even when I:
Rotate the model or reposition it
Duplicate prints across the bed
The mark always shows up in the same area, even if the affected part is mirrored or repositioned.
The mark will rotate with the part
I have 2 p1s printers and the other prints the part flawlessly so its not a geometry based issue
Diagnostics I’ve Tried:
Swapped filament Re-sliced with different seam/wipe/coast settings Printed multiple copies — all show identical defects Rotated model 45°, defect stayed in same printer location Cleaned nozzle and heatblock Verified nozzle tightness while hot Inspected model geometry — not geometry-locked
Questions:
Has anyone seen print defects that only show facing one edge of the bed?
Could this be a stepper sync issue or partial Z desync?
Should I open a support ticket, or is there a deeper maintenance fix I’ve missed?
Is this a result of the off brand nozzle I installed?(I have 10x OEM bambu nozzles on the way so I will report back if this fixes it.)
I run a small business with these printers producing a functional product and this is now costing me money and headache. So thanks in advance for any advice — I love the machine, just want to get this bug squashed.
Even with a standard bambu labs RFID print settings and bambu labs PETG HF I still get the mark so its not speed reletated. My other printer does not cause the mark. I get my new nozzles today so hopefully that ends up fixing it. This printer has been basically down for 3 days now as I dont want to waste any more filament and I wrote 1 star review on amazon for the nozzle(which also shipped with a DOA fan…) I am hopping the new nozzle fixes it. I will never buy aftermarket printer parts again not worth the financial risk to save a few bucks or for 2 day shipping(prime.)
I have determined that the mark is related to the seam. It happens with the change in direction of the nozzle. So it might be my retraction settings but imo this new nozzle is way too sticky and the PETG is sticking to it and causing it to mar the print as the nozzle changes direction at the seam. Even with slice engineering plastic repelent my plastic just sticks to this nozzle like no other.
I adjusted the z-hop settings and retraction but it still does not solve my issue… This nozzle just straight sucks for print quality.
That is fair and something I didnt really think about prior to the purchase. I use about 10 different PETG filaments from bambu labs in my production and having to develop new print profiles for each one is a time investment I am not willing to commit to. Thank you for taking the time to provide a solution! It looks like the new bambu lab hot ends I will be recieving today should solve my issue!
I’ll toss this out there too. I am guilty of this back in my Creality Ender days.
Don’t buy aftermarket hardware to hang off your printer unless you have a specific need.
There is this gigantic ecosystem that developed around things like Creality Ender’s and Ender clones from other companies and they all will tell you how much better your machine will run with their aftermarket part. That’s called marketing.
I bought a ton of aftermarket stuff for my Ender-3 Pro and for the most part those parts did not make a marked difference in a junk machine’s junk performance.
There are lots of people who don’t really care about printing actual stuff. Their hobby is tinkering with the machine and so they love slinging aftermarket hardware at their machine. So those folks are buying parts to feed their tinkering habit. Printing is secondary.
I would not be surprised if aftermarket parts sales have seen a noticeable drop after Bambu really started eating into the machine sales market.
Those aftermarket manufacturers want to sell into the Bambu Labs customer base and how do they do that? Sales and marketing.
I bought a couple of Panda parts for my P1S (light & Touch) that were not worth the money and came off the machine pretty promptly
SOS: Repeatable Print Defect Only in One Area After Nozzle Swap – P1S Help Needed
Problem Description:
Diagnostics I’ve Tried:
Swapped filament
Questions: