You can trick the printer without changing any Z offset values -
If the nozzle is too close to the print bed, put a sheet of aluminum foil under the bed before doing a bed leveling then remove the foil before running the print. This effectively raises the nozzle (lowers the plate) as far as the printer is concerned.
If the nozzle is too far from the plate , do a bed leveling then place a sheet of foil under the plate before running the print. This effectively lowers the nozzle (raises the plate).
I have a similar problem, the nozzle is too close to the bed.
I tried with another plate, different nozzle.
I did tramming, bad leveling.
Tightened the hotend heater screws.
Nothing helps.
I didn’t read every post. I do not know if you have used different filaments. I had a similar issue after several prints. What it turned out to be was quite simple. I was printing some models with PLA and others with PETG. These filaments are incompatible, they will not stick to each other very well. PETG leaves chemicals behind on the build plate that PLA does not like. So washing the build plate with a small drop of liquid dish soap and water, rinse well, and dry solved the adhesion issues for PLA. I always wash the build plate before a larger model is printed.
Another issue I found with adhesion. In this case Silk from DO3D. Bed adhesion was nowhere near adequate. Parts easily were removed while the bed was still hot. This turned out to be speed for the first layer. Default speed was 50mm/s. Turned this down to 20mm/s and the adhesion was really good.
It is not always mechanical or printer repeatability. Often it is the filament and print settings.
Hello @1activegeek , I hope you will solve your problem but maybe it will help , I have exactly the same problem and I solved it by changing the nozzle …
So the one when I have the problem is a new one bought on Bambu Lab store when they did their discount for their birthday . So I m thinking of a bad serial manufacture of nozzle … I opened a ticket , I will inform you what they will say.
I still haven’t been able to solve this problem.
I tried downgrading the firmware to a previous version.
Tried an older version of Bambu slicer.
Tried the hardened nozzle.
Factory reset printer.
Calibration, bed leveling, bed tramming.
Lowered the flow ratio.
Without success.
Could this be some kind of mechanical fault?
Maybe on the z axis?
Thank you all for the suggestions along the way. Believe it was in fact something hardware related as now after replacing the hotend with the replacement, it is now laying down a beautiful first layer.
I’d suggest opening a ticket with Bambu support. Knowing that I could adjust this manually using the slicer, led me to believe (and thankfully support finally believed/agreed it seems) there was a slight variance in the mounting of the hotend relative to the measured standards.
One thing you should try to validate - modify the Z Offset manually in your Bambu studio by a very large amount (default was -0.02, I changed it to I think 0.12). This will basically add a large offset and see if it works. If you’re still hitting the bed too much, make it slightly larger. The worst thing that happens if you set this to say 0.3, is your extruder tries printing in air. The damage could come if you make it MORE negative (i.e. -0.10 instead of -0.02). If you find some luck in modifying that Z Offset, it’s very likely you have a similar issue with regard to the hotend mounting. It was hard to tell, but I do believe there was a minor variance in the holes lining up on the replacement part when I eyeballed it. But alas, 0.1mm is pretty damn hard thing to tell with the eye.
Worth noting of course that if you are NOT using the textured PEI plate that it comes with, then you would need to add a different line outside that if statement to adjust the Bambu defaults.
Hello , to finish my message ,I will got a new nozzle , bambu support confirmed that the problem was the nozzle after some tests and a video that I sent to them to see the problem.
So @1activegeek , maybe your nozzle was defect too ?
Anyway glad that you solved your problem and mee too
I modified the offset to 0.06, and it is better. But not for every filament. Some filaments need a different offset for a good first layer. Then there is one more problem, it looks like over extrusion on the edges.
And on the yellow cube with the same settings, it looks more like under extrusion.
I can’t get a good quality print anymore.
