Has anyone had an issue whereby their A1 nozzle is scraping the print at finer detail settings?
I’ve wasted nearly a full spool of filament over the last week trying to print one part, as the nozzle keeps scraping and whacking off the already printed supports and prints to the point where they’re dislodged from the bed.
Im using eSun PLA+, at 0.08mm layer height on the standard nozzle. The first couple of layers will be fine, but once the model is about 5cm high the scraping begins. I messed around with the default printing profile for my filament and increased the Z-hop distance to 0.7mm - this reduced the amount of scrapes (not by much, mind), but it also ruined the top surface quality of the finished print. I’m using Gyroid infill.
i have only had my A1 for a week, and it’s basically been a nightmare trying to get the thing to work properly.
I’d preface this that other experienced 3d printing enthusiasts probably have more definitive answers.
Had similar issues previously with PETG. Mainly on parts that are taller than 5cm(2").
I first guess would be; Speed. I’d lower/cap most PLA parameters to
105-200mm/s for all visible layers.
I set support & infill between 240-260.
Another setting that’s under quality could help. It’s “Avoid crossing wall” & I like to set it to 200mm. It really helps with round/larger objects because it’s forced to travel almost like spiral vase.
Check debris under your build plate?
Part warpage? ( Too hot or cold bed. Is there a large difference between bed temps during the print? tend to cause warpage.)
Bed flatness or is there anything wrong with the plate?
Doesn’t have to be “level”. Not too sure about exact details about this but I’d guess it’s not suppose to be more than 0.5mm gap from a ruler (when heated). From what I gather It takes about 5-10min for the plate to settle from heating up.
Hope it gives some ideas that you didn’t already think of.
Best of luck!
These are excellent tips, thank you! I’m reprinting the model at the moment with slightly denser supports to try and resist knocking and scraping, but i’ll be lowering the speed next time to try and mitigate the issue.
It’s interesting that you mention debris and part warpage. The heatbed itself and the little bump that was added to the revised heatbed at the back are both covered in scuffs and marks - I’m worried that this could also be the root cause of the issue. These problems were the first things I noticed out of the box. I have a ticket open with Bambu support for both of these issues, if I hear anything else useful back I’ll be sure to relay it here so others can benefit.
For anyone curious, the print failed again at about the 5cm mark. I was literally looking at it as it scraped across a support and snapped it clean off the build plate.
I double checked the speeds my printer is printing at, and it’s actually really low - much lower than the suggested speeds to try within the 0.08mm preset.
I’m going to keep trying until I hear back from Bambu.
Have you got anywhere with this? I’ve got just the same issue. I’ve calibrated the LA to death, dried the filament and washed the plate. Made no difference.
I had some scraping sound issues in the past. In most cases workaround was to slow down print speed to “silent” (50% of the speed), however this doesn’t fix the main cause.
What you are facing is an over-extrusion. Extruder is pushing layers that are minimally higher than expected and gets hard while cooling down. You expect to have a layer that is 0.2mm but it gets 0.205mm. Next layer is printed on the top but is again over-extruded. With more layers (the higher printout gets) this overextrusion grows to something high enough to reach the nozzle - which starts to scratch. When your printout becomes even higher, either your model would be displaced and finally pushed out of the plate (or the plate moved), or your nozzle, head or other parts become damaged. Often motors (gears or transport belt) just jump over a single “step” and your model is moved a bit at one height.
Correct solutions:
adjust flow rate and temperature by:
lower the flow rate which is often specified in mm of length but bambu decided to use cubic millimeters of volume)
lower temperature (usually lower temperature means less liquid material which is extruded slower)
observe if there is stringing effect (although not the same issue, correct temperature could help)
there are many other options you can adjust in bambu labs - it just needs time, experimenting and some experience you would gain
I wonder if higher models with LIDAR can handle this somehow…
I’m still a newbie here when it comes to 3d printing (and I have printed about 20 kg of filament already). So ask and seek for help from other users.
