I don’t know if it generates too many retractions on the Z-axis compared to other slicers (it is a software problem, not a hardware problem); if it does, they occur where they shouldn’t. The problem is that where it should retract the Z axis, it doesn’t, and the nozzle scratches the piece. The nozzle will eventually deteriorate, and the prints have many adhesion problems because the nozzle forces them. I’ve noticed in the community several open issues related to bed adhesion, and I’m afraid it might be connected to this.
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@amzaldua as you mentioned on Github, your use of the term “retract” on the Z-axis is actually a failure of the nozzle to “hop” over obstructions. I think you’d said that you used “retract” due to your background in programming CNC machinery.
Exactly what i observe during prints on my P1S. The nozzle is scratching at the infill and it’s absolutly horrible if you print objects with 100% infill.
Does anybody solve this problem?
You can mitigate this by adjusting some parameters:
- Disable “Reduce infill retraction.”
- Change to “Normal” Z-hop type.
- Reduce the “travel distance threshold.” I have it set to 1mm, but you can reduce it to zero if desired.
- Change “infill types” to either gyroid or honeycomb pattern.
For more information about Z-hop retractions, be aware that there is a bug in BambuStudio/Orca Slicer that causes some Z-hop movements to be missing.
Regarding the P1S, do you own one? How is its performance? I’m encountering hardware issues with the A1…
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hey thanks for your Tips, i like to try them out andi think bambu has to solve this asap if there is such a bug like this.
Yes, i have an P1S since one and a half months and its perfect for me. But since 2 weeks i have tons of failed prints. Espassially at long prints with PLA + (matte, Geetech). For example i try to print the “mesh raptor” from makerworld as big as possible and after 10 try’s it doesn’t work one time.
The base of this raptor is fullfilled with the recommend settings from the creator and the nozzle scratches at the infill for 50 mm and more. Now the nozzle clogs 7 prints in a row with different temperatures and filaments.
I hear that the previous version of Orca Slicer, version 1.8, doesn’t have this issue. 
Try using these parameters and let us know.
Cool model.
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Any update on this? Experiencing the same issue with the A1 Mini.
Also, I can´t find the following settings, is this only for specific printer models like P1S?
Is this problem solved? I have A1 at home and I have a similar problem with the nozzle hitting the print in most of my prints. I clean the build plate with dish soap before printing. I have also tried with different brands of filaments and different infill types but the problem is not completely solved. I will try your suggestions for this problem.
Also I have a similar problem with the X1C, although it’s not very noticeable, but the printer probably tolerates it.
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same here and actually not keen to adjust filament settings to fix such a bug…
I opened this thread in January, so you might not have another option.
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Probably, in your X1C, you don’t have any problems, but in the A1 series “Hotend Heating Assembly,” the four back screws eventually loosen due to the vibration caused by friction.
I have opened the support ticket for that and they also suggested tightening the screws and I have tightened them but it didn’t fix the problem. Only working solution is for me is manually setting the z hop in the filament settings.
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Is this enough? Do we need 0.1 or 0.2mm Z hop when retract maybe?
I checked another topic about this and it’s not so simple as I thought.
The key to addressing this issue (dragging on infill) with Bambu Studio and Orca Slicer is to change these settings:
In Process Profile:
- Strength / Sparse Infill Pattern: Choose a pattern where the lines don’t cross, such as Gyroid or Cross Hatch.
- Other / G-code Output: Disable the “Reduce Infill Retractions” option.
Additional changes you can make to improve this issue are:
In Printer Profile:
- Extruder / Z-hop When Retract: Set to 0.8 mm.
- Extruder / Z-hop Type: Choose either Spiral or Normal (Normal is more optimal, but it worsens the finish of the top surfaces).
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18/9/2024
Changing those settings will fix the ‘dragging on infill’ problem.
I now use the rectilinear sparse infill.
I also checked the ‘Precise wall’ setting under the ‘Quality/Precision’ section.
Now printing perfectly even with crappy old cheap filaments.
A1 Mini
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There were some changes in latest Bambu Studio regarding Spiral z-hop:
I tested the new version and there is indeed less stringing.
Maybe our “dragging on infill” problem could also benefit from the new version?
I’ve been having similar issues, and everything I try to help it just seems to make things worse or introduces new issues.
Using OrcaSlicer V2.20
I’m not sure when this started, but I began having little flakes on the outer walls of my prints around the time when I started hearing the scraping sounds. I also started seeing a lot more posts from other A1 users reporting the same issue around this time.
The “flakes”. Its like a very thin layer of filament stuck to the wall
I thought it might be a firmware issue so I rolled back to 1.03.01, and also increased z-hop to 0.8, neither of which helped. Yesterday I turned off “reduce infill retractions”, and I didn’t hear any scraping sounds, but I noticed it was hopping more than it needed to while printing infill. I also noticed a ton of fine hair-like stringing which I have never gotten before.
So I turned “reduce infill retractions” back on, reduced z-hop back to 0.5, increased retraction to 1.1 and started another print. Now, the scraping issue is back and I’m still getting really fine stringing. This is with the same filament i’ve always used without issue, regardless of whether its dried or not. I did try drying it, and it hasn’t changed anything, which makes me think this isn’t an issue with humidity
I should note that apart from the flaking issue I mentioned above, I haven’t really gotten any full on print failures due to the scraping. It is still really annoying, and combined with the new stringing problems its enough to ruin entire batches of prints
P.s I tried to embed photos in this post but it won’t let me…
same here , i can clearly see the Zhop happening tho ! I am using Orca and changing Z hop when retracting to +.8 dsnt seem to change anything…
I still hear my father shuffle the card , and it was the same sound.
Same thing here. My A1 was having trouble from day one and i was thinking that the problem was the filament, placement of the printer, moisture in the air everything but problem with the printer itself. I have now enclosed the printer, bought bambu lab filament, bought a filament dryer but the problem remains. Yes i can mitigate the problem a little bit with mentioned settings but now i am afraid to print everything taller than a few centimeters and lasting a few hours. I feel i must always babysit my printer because it would just knock the parts of the bed even with the brim around them. I am also thinking of selling the printer but i dont realy want to unless the problem doesnt get solved.
Please bambu solve this problem because there is a lot and i mean a lot of us with the same problem and it is time that you do something about it.
Thank you
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