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lemmy - Link to source

Conception flaw or a bad hotend replacement ?

This came from my Bambu P1S, I did a hotend replacement a week ago and I only print simples models since.
This time I tried to print a model a bit more complexe with supports and it failed.
Filament is dry, ambiant humidity is 7% in the AMS.

Do you have any suggestions ? Thanks

#3dprinting
Tato položka byla upravena (1 měsíc ago)
in reply to gdaofb27584

paf
lemmy - Link to source
paf
• •
Did you check preview mode on slicer? Do you use your own settings?
Is purge line always that long?
in reply to paf

gdaofb27584
lemmy - Link to source
gdaofb27584
• •
I use factory preset "0.2mm standard" for a 0.4mm hotend. The purge line looks normal to me.
I had an other comment with bambustudio and freecad files.
in reply to gdaofb27584

paf
lemmy - Link to source
paf
• •
Looking again at your pic and wonder if part tilted while printing due to small area on bed. If it did, adding manual support to the print would help to stabilise as it goes up.
Only thing is, that doesn't explain why there is filament on the right of the picture.
in reply to gdaofb27584

gdaofb27584
lemmy - Link to source
gdaofb27584
• •
For records, this is the model in Freecad and how it is sliced in BambuStudio
in reply to gdaofb27584

Schmaker
friendica (DFRN) - Link to source
Schmaker
•
According to object rotation I don't think it's printing issue, but nozzle hit the model and rotated it

3DPrinting reshared this.

in reply to Schmaker

gdaofb27584
lemmy - Link to source
gdaofb27584
• •

You are right !
I did a second try, with a different preset "0.08 High Quality". It also failed.

The timelaps show the hotend hitting the model base. ( see this streamable )
It's the first time it happens, I don't know what to do to fix it 🤔


Watch video_2025-07-31_15-09-10 | Streamable

Watch "video_2025-07-31_15-09-10" on Streamable.
Streamable
in reply to gdaofb27584

MysteriousSophon21
lemmy - Link to source
MysteriousSophon21
• •
Looking at your video, that's definitely a nozzle collision issue. Try enabling "Z hop when retracted" in your slicer settings (should be under travel options). This will make the nozzle lift slightly when moving between parts, preventing it from hitting your model. Also, for models with such a small footprint, consider adding a brim for better bed adhesion - looks like the impact is knocking it loose from the bed.
in reply to gdaofb27584

TheRealKuni
piefed - Link to source
TheRealKuni
• •
I might be seeing it wrong, hard to tell from just this perspective, but could it be placed so the entire side, or entire back, is making contact with the bed? Increasing your contact surface can help dramatically as I said in my other reply.
in reply to gdaofb27584

Applesauce
lemmy - Link to source
Applesauce
• •
Have you tuned/dried the filament? As others suggested, you may want to add additional supports and slow the printing speed down.
in reply to gdaofb27584

Taleya
lemmy - Link to source
Taleya
• •
The print itself looks pretty mint, apart from the failure. If you don't have hot end leakage around the screws this looks like a design / orientation placement error
in reply to gdaofb27584

TheRealKuni
piefed - Link to source
TheRealKuni
• •

Check your bed adhesion (clean the bed with detergent and hot water, and I recommend a quick wipe with 91% IPA before each print) to prevent the model rotation seen in this picture, but in general parts with that little bed contact can be difficult to print correctly. If you can’t find an orientation that fits on the bed with more surface area, then slow the print down to minimize forces pushing the print. While supports help, they don’t hold onto the print as firmly as the bed does (on purpose).

I’ve run into some frustrating issues with small contact points with print beds. Another option is to use a smooth PEI plate and use a glue stick or Bed Weld or something to help improve adhesion.

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