The box on the left was printed about two months ago while the box on the right was printed yesterday. Same model file is being used and the same Bambu PLA Basic filament, although I am using a newer spool. The same bumps occur when I print other files, but this picture illustrates the problem the best. What causes the bumps and is there a way for me to get rid of them?
To me, that looks like you have seams set to random.
This looks like the âzitsâ you get from random seams:
Does using one of the other seam options help? Do the zits show up in the preview window in studio? (If seams is showing, that is!)
To me, that looks like you have seams set to random.
Yes, seems are set to random for both prints. Iâm trying to figure out why they are so large on the most recent print.
Without any additional information, I would be continuing to speculate. If you could share your settings for both prints maybe someone can spot what is causing this. Otherwise, you will like get others guessing, like I did.
The other print doesnât look like seems are random, but if you say it is, I cannot refute your statement. You hold all the information here, we are only trying to help.
The only other guess I can make with the given information is that the filament could have absorbed to much humidity and the âzitsâ as stated above could be the water boiling and effecting the print. Did you dry the filament?
Does using one of the other seam options help? Do the zits show up in the preview window in studio? (If seams is showing, that is!)
Yes the âzitsâ show up in the preview. Both prints were done with seems set to random. But the seems (zits) are much larger in the later print, and I only started having this issue recently.
Iâm using the Origami Box model (https://makerworld.com/en/models/423164) and am using the Basic Bambu PLA (black) filament settings for slicing.
I placed the filament in a dryer this morning and will trying printing something this evening when I get home.
As mentioned the âSeem set to randomâ is what is causing the location of the âzitsâ. Your point that they have gotten worse probably means you need to calibrate your pressure advance value for the filament as this is what will affect how the filament is dispensed at the seam. Would also suggest ensuring that you have performed the belt tensioning and rod cleaning maintenance.
If you used the designerâs print profile, it indeed is set to random seams.
Is it possible that (about two months ago) you previously used the âAdjusting parameters for quick dual color productionâ profile instead? I see that one doesnât have seams set at random.
I donât like wasting filament when I donât have to. If there was a print profile that separated the colors on different plates, that is the one I would have used.
Although I know anything and everything gets blamed on wet filament (well, ok, filament with too high a moisture content), but even so I wouldnât rule it out. It makes extrusion foam up almost like gorilla glue, so maybe it would make a zit into a bigger zit.
Hereâs a picture I took of a print whose filament had been dried unevenly, resulting in banding: some bands being fine and some bands wretched. It shows a more extreme contrast than what the OP showed in the OP photo, and presumably the OPâs filament was uniform at whatever moisture level it was, but the point Iâm trying to make with this example is that even though the moisture difference between right and left print in the OP photo may not have been as great, it may nonetheless have been enough to produce the artifacts on the right print in the OP photo.
If you zoom in on the OPâs photo, youâll see what I mean.
Unfortunately, the photo either lacks resolution or was overly compressed, but from what is visible it looks like thereâs more going on than just zits.
Thanks for the advice. I thought that the Bambu calibrate for pressure advance before each print, I have been doing the recommended maintenance of lubing the x/y axis rails during the two months since I purchased it.
Thanks for the suggestion. I wasnât able to find that option in my settings so I canât definitively say that I didnât adjust it, but I donât recall ever messing with a setting like that.
I think that it could have been the spool of filament. I dried it yesterday and tried another print and the zits remained but were smaller than before. I donât have enough filament left on this spool to do much more testing, is Iâll probably just try a newer spool and print the box with an aligned seam.
Thanks to everyone for your help and suggestion!
And thank you for following up on all the suggestions and letting us know as best you can what worked and what didnât. I wish everyone would do that. That way anyone with the same issue in the future reading this thread will efficiently know what the correct solution is without having to trial and error among the suggestions. And besides, we all sharpen our acumen with quality feedback, so itâs makes a good win-win for everybody. 
To that end, if you ever find out more, please be sure to report back!
something similar happened to me actually when I print thing sometimes I get a line running from top to bottom and. donât know also what to do
at first glance i would say moisture. dry the filament first.
