I’ve been using my X1C for a few days now, and just received the filament I had ordered during the BF sale. I’m printing the last few parts of a respooler, and noticed buildup on the material while printing. Haven’t seen this on any of the other parts I’ve printed for the respooler. I’m using the Bambu Lab slicer, with bed levelling, AMS, and flow calibration enabled.
This looks like an overextrusion/flow rate issue, but I’m not sure. The print hasn’t failed, at least not yet. But I see the model wobble when the print head moves over those bumps, accompanied with an audible sound from the print head. Could someone help me figure out what’s going on?
I think I know what happened. I had used almost all of the 250g of Bambu Green PLA that came with my printer. Then I added full new roll of Bambu Green PLA and started the print.
The printer calibrated the original spool of filament, but I forgot to calibrate the new spool. And it looks like there may be different extrusion properties for each filament. The problem only started once the first roll of filament ran out.
So now the question is – do I keep going on the print, 4 hours into a 12 hr print, and hope thing succeed, or just can it and start fresh?
If its just 1 cog\part thats wierd, stop that part individually and let it run. Could just be 1 bad part?
Also - if any of the other parts are finished, you wont need to reprint them?
If ALL parts are now showing the buld up \ bad finish, I would kill it… 4hrs \ 300g? lost is better than another 12 lost and a kilo+ of filament.
Just my opinion, cant see how bad the rest is - but if its an extrusion\calibration issue - and you confirm that across all parts. its not going to fixable now - and you have no idea how reliable those parts will be . spin true, threads work etc , if it does finish all 12 hrs…
Grid infill strikes again…
Should be a sticky at the top of the page.
It’s because when laying grid infill the nozzle passes over the top of the previous layer which has already cooled and leaves little bumps where it passes over the top. The nozzle hits them on the next pass. I believe the only reason it’s the default infill is as someone else pointed out, there is a bug when using infill combination, other infill patterns can leave gaps which lessens the overall strength of the infill but grid doesn’t.
But for everything else, you’re better off using an infill that doesn’t pass over itself in the same layer. Gyroid is good and quick and still strong. Rectilinear is still very good and is quicker but not as strong.
Found this good write-up about the different infill patterns. It actually mentions that grid infill can cause “annoying noise or even a print failure due to the nozzle going over the crossings where material accumulates”. This happens quite often with BBL printers as the nozzle is moving so fast over those bumps.
Thanks, I did hear quite the noise from the print head bumping into the infill pattern, but I didn’t attribute that to the bumps that formed near edge of the part.
I decided to keep printing the part, as only 2 of 6 parts showed bumps. The final print came out looking great, only a small cosmetic defect on the side of one of the parts. You can also see a minor difference in color in the bottom right part from when the X1C switched to the new roll of filament.
