Odd issues with prints sticking

Bambu Lab P1 Series Troubleshooting
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Wondering if anyone could start pointing me in a direction to help with these weird issues I’ve been having. Here is a little background:

Bought my P1S around Halloween and used it all the time. Never had any issue with anything sticking to the plate, never any leveling issues, etc until recently. I wanted to print a filament winder so decided to print some of the gears in ASA. Upgraded the nozzle to a hardend steel for a project awhile back (printing blow in the dark) and kept it on ever since.

Noticed I had issues with some of gears coming loose and had to “skip” certain ones. I thought maybe it was the way the certain gears were being printed so I rotated them in the slicer, slowed the speeds way down (even slower than normal for ASA) and tried again. Well again that one gear popped loose half way through the print so I skipped just it and continued on. We were headed for vacation so the ed off the printer and left it sit.

Come back from vacation and son wanted to print something so he turned it on and we started the file. This time we used PLA so I hooked back up the AMS units. The first layer was HORRIBLE!!! PLA looked like it was bubbling, hard to tell any actual lines, turned into a mess and ripped off the build plate before it even got done. Took off the textured plate, cleaned it and tried again. Well not any better but it finished. The first layer was horrible though.

Didn’t know what to think so turned it off. Next day daughter wanted me to print a figure for her. Started it and it too was horrible. By the 3rd layer it was printing in mid air. Stopped, adjusted settings, tried again… and again, and again. Finally stated to google. This led me to lightly scuff the build plate, wash it, IPA it, factor default the printer, remove bambu studio and handy from my computer and phone, start fresh. I also decided to calibrate each filament I was using. Never did that before but did a flow rate along with the other one (forgot the name). Well things got way better even before the calibration. Right off the bat things were working again. Mind you I was only printing a few items.

Well last night ran into an issue. Put three items on the plate and started the print. By the 2nd later one item was peeling up and a corner of it wasn’t a corner but a mess so I skipped it. The other 2 printed fine though. Printed the 3rd item by itself and great. So I finished the calibration for all the filaments and printed the whole figure. Turned out great. Tried to fill up the build plate this morning and noticed items printed in certain areas did not stick (even with a brim) yet other printed and stuck just fine. We arent talking about edges but just certain areas of the plate. Front edge, from the center a little ways out to the right, back left, etc. does anyone have any idea what First would have caused the issue I ran into and second what’s causing these issues I’m running into now?

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This all sounds like adhesion issues are the root cause. Wash the plate again, dish soap and hot water. Give it a really good scrub to get the oils off. Pat dry with a paper towel being very careful not to touch the build surface. Don’t use IPA afterwards. Try printing likes this, you can also bump the temp up 10c on the bed to help adhesion.

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You had mentioned switching nozzles. Did you replace it with a complete hotend or did you swap the parts around? If you have an extra complete hotend, you may swap it out to see if it performs the same or not. Might help pinpoint issues.

Some things you may want to check:

  • Make sure you have the right nozzle selected in your slicer.
  • Verify the hotend is firmly screwed into the toolhead. Any loose play can cause inconsistent layer adhesion.
  • Check to see if the nozzle is bent. ASA is known for having warping issues and your nozzle may have run into the part causing it to bend. Not sure how likely this is, as my nozzle hasn’t experienced bending when running into printed parts in this manner, but it’s always possible and worth checking.
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It was a parts swap. Thing is it has been working fine and I have had to disassemble it a few times since then due to broken filament causing a jam. Had the issue originally on the stock hotend so at that time I swapped to the hardened one while I worked on removing the jammed filament.

As far as the loose hotend as I stated previously I removed it a few times already during this journey. The most recent was the day before I posted. Thought maybe I had a clog causing the problems. To my surprise nothing was out of the ordinary with the hotend or the extruder. Put it all back together and same issues as before.

I took a good look at the hotend and didn’t notice any issues with it being bent or anything. When it failed it did one of those knock the part off and print in mid air. Thankfully everything I wanted to penny I placed in the middle of the build plate so nothing could cause a “jam” due to the toolhead getting a part in the way and causing it to not be able to move.

Now remember I did a factory reset, removed all my settings, scuffed the build plate, washed, rinsed, reinstalled, etc and things all of a sudden started working like they had in the past, meaning no issues. Well I guess there is a small issue that seems to crop up every now and the with a small section of a part not being “layer down” on the plate and getting drug over to another place. Almost like the nozzle is within tolerance at the beginning of a line, ends up being too high at one point, then comes in tolerance again… causing a certain section not to adhere. And the kicker is it’s random. I can print off the same grouping of parts and if I do it a second or third time the part that had the issue no longer has the problem.