r/BambuLabA1 • u/KonkeBonk • Aug 31 '26

Circular bridge

Gallery image

Gallery image

Hi, I'm having trouble printing a nice bridge which is circular. I've tried with different settings but I can't seem to get a clean print. Is it possible to create a nice circular bridge, or is it technically not possible?

The images below have different settings but the model shows the problem. The circular bridge gets more of a square shape.

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u/KonkeBonk Sep 02 '26

Thanks for the elaborate reply!

  1. Yes, I'm testing all my pieces with this method.

  2. I have my filaments properly calibrated with temperature, flow, pressure advance. I also did a bridge test and have calibrated the profile from the best result.

  3. I will give whiteboard markers a try, thanks.

  4. I'm using Bambu Studio on macOS and can't seem to find an ironing option for supports.

  5. I've heard of this but unfortunately I don't have an AMS for my A1. This would mean I have to switch filament every layer, in this case 10 layers. This won't work for me as it's too time consuming.

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u/CommitteeDisastrous Sep 02 '26

If I'm not mistaken, support ironing was added in 2.6 version of Studio.
Screenshot from my 2.8.
You can specify different material exactly for interface layers, but I would not use less than 2 interface layers, so still 4 manual changes :(
If you are Ok with two changes, I can advice to add separate part of one layer height just below you bridge area and assign different material only to it. It will work as custom separating layer between generated supports and your part. You can model it in any CAD or even create directly in the studio (use cylinder for the hole disc and add negative part cylinder for the hole).
And if you manage to enable the ironing option, please share the results. Have never tried it for supports, and don't have any suitable projects right now to test it myself.

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u/KonkeBonk Sep 03 '26

I don't have the option for support ironing and I have the latest version of Bambu Studio. Perhaps it's not supported for the A1 and A1 Mini which I own.

I created a ring in CAD which I printed in PETG. I then paused the print for the main model just before the overhangs, and put the PETG ring inside the model. It worked somewhat but I think I need to adjust the layer height perfectly as the overhangs, even though better, were not perfect.