this post was submitted on 26 Dec 2025
20 points (100.0% liked)

3DPrinting

21957 readers
13 users here now

3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.

The r/functionalprint community is now located at: or !functionalprint@fedia.io

There are CAD communities available at: !cad@lemmy.world or !freecad@lemmy.ml

Rules

If you need an easy way to host pictures, https://catbox.moe/ may be an option. Be ethical about what you post and donate if you are able or use this a lot. It is just an individual hosting content, not a company. The image embedding syntax for Lemmy is ![](URL)

Moderation policy: Light, mostly invisible

founded 2 years ago
MODERATORS
andypiper@lemmy.world
j4k3@lemmy.world
GrayBackgroundMusic@lemmy.zip
20
Why does my overhang/bridge look so bad? Isn't this small enough to be done better? (programming.dev)
submitted 2 months ago by nieceandtows@programming.dev to c/3dprinting@lemmy.world
11 comments fedilink hide all child comments
 

top 11 comments
sorted by: hot top controversial new old
[–] paf@jlai.lu 9 points 2 months ago* (last edited 2 months ago) (1 children)

It's not a simple bridge as you have a square in the middle, walls are printed first so it messes up the layer. Just add support either to the whole model or just beneath the square. Alternatively, add one layer at bottom of the square so it will do a simple bridge and cut it off after. Edit: just had a look at the preview and yeah the curves wall are not best for bridge but don't use creality slicer so can't help

[–] LastYearsIrritant@sopuli.xyz 3 points 2 months ago

Raise the area directly around the hole one layer, so the outside two large bridge parts get printed independently without being connected, then the next layer only has two tiny bridges under and over the hole, then the rest will be printed normally.

If it was a round hole, it would be a little more difficult, but a square hole would be really easy.

[–] HelloRoot@lemy.lol 5 points 2 months ago (2 children)

It would help if you showed how it looks in the slicer.

But from the photo it looks like it made the bridge in a circular way instead of in parallel lines. If you can make the bridging go strictly in parallel lines from top to bottom, it should turn out better.

[–] ExcessShiv@lemmy.dbzer0.com 6 points 2 months ago

It's kind of crazy that slicers still attempt to make something like curved bridges.

I had a 300mm long part with a 10mm wide slit in it along the length of it, no matter what I did (bridge setting or part orientation), the slicer insisted to create the bridges for that slit parallel to the long direction, attempting a 300mm unsupported bridge, instead of orthogonal so it was only 10mm bridges.

[–] nieceandtows@programming.dev 3 points 2 months ago (4 children)

Yeah, you're right. How do I make it go in parallel lines? I'm using Creality Print, btw.

[–] roofuskit@lemmy.world 4 points 2 months ago (1 children)

It looks to me like that's not a flat area. That's why it's not using parallel lines. If you want good bridging it must be flat.

[–] piranhaphish@lemmy.world 2 points 2 months ago

This is the answer.

Alternatively, use supports.

[–] CmdrShepard49@sh.itjust.works 3 points 2 months ago

See if you can change the number of bottom layers or the bottom layer pattern to get a different result.

[–] HelloRoot@lemy.lol 2 points 2 months ago* (last edited 2 months ago)

Honestly, I just keep changing all sorts of bridge related and unrelated settings until it does what I want. Maybe the piece lends itself to being printed on the head or on it's edge (45° tilt) like this: https://www.reddit.com/r/3Dprinting/comments/mhcvut/pro_tip_if_youve_got_a_complex_part_youd_like_to/

Sometimes even layer height can affect bridge behaviour.

But first thing I'd do is to rotate the piece by 90° on the bed and see if the thin bridges that you can see behind the thick curved ones, change their orientation to be short instead of long.

And then try to figure out what makes those thick curved bridges happen.

[–] Vorpal@programming.dev 2 points 2 months ago

I would go back to your CAD model and tweak it for better printability. If it was a model you downloaded and without a source CAD model I would just remodel it myself to be more printable.

[–] velindora@lemmy.cafe 1 points 2 months ago

It looks like the temperature is too cold and it’s not sticking together. Is this filament the same brand as the device? I got stuff like this when I tried to use default settings with off-brand PETG

Just a thought.