Regarding the issue, here are a few points to address:
• The colliding was primarily found during the grid infill printing
• The colliding was also found during the infill bridging. As the nozzle moves back and forth, it leaves(accumulates) blobs that bump up when changing its direction. Then the nozzle hits these solidified blobs when printing the next layer.
• I’ve tried adjusting the flow ratio from 0.98 to 0.95 and the infill pattern, infill colliding seemed alleviated, but the changing bridging direction still built up blobs, and the nozzle hit them repeatedly again.
• The print will come out fine if I don’t cancel the print, as it does a great job on anything other than the infill/bridge. But printing with constant nozzle collision, I don’t know if it will potentially harm the bed or XY rods, so I will leave it idle till I find a solution.
Additional notes:
I print with Bambu PLA only, cool plate, glue applied, BS slicer default settings for the brand’s PLA. 0.12mm layer height, 0.4mm nozzle. Flimanets stay dry in AMS.
Does anyone have the same issue and potentially know how to fix it? Thanks in advance.
Sadly, I’m in the same boat. This has just started happening to me recently as well. I’ve dialed back the flow ratio to .91, increased the supports, and slowed the print “silent” (50%), dialed the firmware to factory settings, and it keeps happening. The hot end inevitably collides with the print and/or the supports ruining the print. I’ve submitted at ticket to Bambu yesterday, so we’ll have to see what they come back with.
Colliding with infill on grid is very common - with grid, filament overlaps in the same layer causing the intersecting points to be raised slightly above the layer height. Using something else like gyroid which never overlaps in a layer can help significantly.
Not sure on the bridging aspect. I have quality issues with bridging compared to my previous printer, but nothing in regards to blobs and collisions. My issues have been bridge strands failing to connect, surface quality bridging over tree supports, and general bonding issues.
Here are two prints I did recently. This is NOT Bambu filament.
The poop can had issues, but once I put it into silent mode the issue disappeared. There was NO infill here but the can was VERY thin. My guess is some warping was happening.
The scraper was done with a layer height of .1 This also caused issues with bambu filament as well at this layer height. Looks like its hitting the infill, grid or gyroid it hits with the .1 layer height. I reset the layer height back to .2 and the bambu filament had no issues. I did notice on the plate has a small crest in the middle, but this wouldnt cause the issue as I was seeing hitting in the lower section of the plate. The other filament at .2 layer height still has a slight issue.
I had printed with the other filament the past few days, but parts were more compact and I didnt see any issues with .1 layer height and hitting infill with those parts.
I find that the infill sometimes pushes into the outer wall too much.
If your model allows it (i.e. no steep overhangs), changing the order to outer/inner/infill can help maintain the wall dimensions.
If you can’t do that, try reducing the infill overlap percentage from the standard 15 to 10 or 12%
Oh, and change to gyroid infill. It’s usually quicker and stronger in all directions and like others have said, the nozzle doesn’t cross over previous laid lines so there’s less chance of it picking up filament and depositing it where it’s not wanted.
For me this was the easiest way to reduce the relative overextrusion for infills that’s a side effect of this option. In my case, printing a no name pla at 15cm3 resulted in clearly visible bumps on any intersection - never had these with bambu lab pla at 21cm3 even with this option checked. Luckily the filament settings in Bambu Studio have the option to override this global setting automatically. Hoping for orca to include this in the near future too.
