After a large plastic blob on the nozzle, I was forced to replace the hotend heating assembly due to a cable break. Now, I have the problem that the nozzle is too low during printing, hardly any plastic is coming out, and it scrapes a bit on the surface of the printing bed. After countless attempts to level the bed manually and automatically, nothing has changed. Unfortunately, Bambulab support couldn’t help me further; they recommended re-leveling the bed and tightening the screws on the hotend heating assembly, which I did (without success).
Additionally, Bambulab support analyzed the logs without finding any anomalies. They also recommended a new printing bed and a new hotend heating assembly.
For me, the printing bed seems perfectly fine—it’s neither tilted nor does it have deep scratches. And the hotend heating assembly is brand new.
When I increase the first layer height in the Bambulab slicer, the result improves slightly, but it is still unsatisfactory.
I am printing with Overtrue PETG, and the printer does not give any error messages.
I would appreciate your opinion and recommendations.
The blob and subsequent movement could have bent the nozzle. Might need to try a new hot end if you have tired everything else like support suggested.
Are you saying after the blob incident you replaced it? Because if not it’s easy to slightly bend the nozzle when its speeding at 200mm/s or faster with a big blob of filament attached to it and it hits some surface of the print that is attached to the bed well.
I can’t rule it out, but visually, with the naked eye, I can’t see any damage to the hotend. The blob was mostly inside the hotend silicone sock, which caused the hotend to stick to the hotend heating assembly.
Tighten the screws on the hotend heating assembly.
Auto bed leveling.
A1 bed tramming (so that a piece of paper can slide through).
Complete calibration.
Try different filaments.
Try different print temperatures.
Try different slicer settings (only helped a bit by set the first layer higher).
Checking for any damage.
Go to the “Printer profile/Machine code/Machine start code” and search for the following:
;===== for Textured PEI Plate , lower the nozzle as the nozzle was touching topmost of the texture when homing ==
;curr_bed_type={curr_bed_type}
{if curr_bed_type=="Textured PEI Plate"}
G29.1 Z{-0.02} ; for Textured PEI Plate
{endif}
Now, change the value -0.02 to 0.02 (from a negative value to a positive value).
Have you tried a different filament ?
or drying the petg filament ?
glue
the images above look like the filament isnt sticking to the plate ,where it can then roll itself (heat) and stick to the nozzle
i should also ask if you sliced the model for petg rather than another pla for example ?
I can hear the nozzle scratching the print bed. I’m pretty sure this isn’t due to the filament or the filament settings, as I have this issue with both PETG and PLA.
My first reaction would be that the sensor that senses the bed is not in line with the actual length of the nozzle and “thinks” the nozzle is higher than it really is. Is it possible that the new nozzle is slightly longer (and therefore closer to the bed) than the original one?
I started having poor print quality, then dire first layers, then a blob of death.
The blob of death came after I tightened the four screws.
Increasingly thinking the loose screws caused the print quality problems, but something else was the cause of nozzle dragging (which in turn loosened the screws).
Was thinking of getting a new extruder as the eddy sensors don’t seem available on their own, but if a new heater fixed yours…
Kind of unhappy about spending 20 - 50 on a two week old printer that failed itself into uselessness.
If I were you, I would contact Bambulab support if you’re not exactly sure what the cause of the problem is. Personally, I’ve only had good experiences with their support so far.
Additionally, you should monitor the printer for one or two prints after making changes if you’re unsure about their effects.
Bambulab sent me a new hotend assembly, which fixed the problem.