3DPrinting

15751 readers

107 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 [email protected]

There are CAD communities available at: [email protected] or [email protected]

Rules

No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia. Code of Conduct.
Be respectful, especially when disagreeing. Everyone should feel welcome here.
No porn (NSFW prints are acceptable but must be marked NSFW)
No Ads / Spamming / Guerrilla Marketing
Do not create links to reddit
If you see an issue please flag it
No guns
No injury gore posts

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

Bridging direction should be geometry-dependent (lemmy.ca)

submitted 2 weeks ago by [email protected] to c/3dprinting

14 comments fedilink hide all child comments

Bear with me for a moment, because I'm not sure how to describe this problem without just describing a part I'm trying to print.

I was designing a part today, and it's basically a box; for various reasons I wanted to print it with all the sides flat on the print bed, but have bridges between the sides and the bottom to act as living hinges so it would be easy to fold into shape after it came off the bed. But when I got it into PrusaSlicer, by default, Prusa slices all bridges in a single uniform direction--which on this print meant that two of the bridges were across the shortest distance, and the other two were parallel to the gap they were supposed to span. Which, y'know, is obviously not a good way to try to bridge the gap.

I was able to manually adjust the bridge direction to fix this, but I'm kinda surprised that the slicer doesn't automatically choose paths for bridging gaps to try to make them as printable as possible. I don't remember having this issue in the past, but I haven't designed with bridges in quite a while--it's possible that I've just never noticed before, or it could be that a previous slicer (I used to use Cura) or previous version of PrusaSlicer did this differently.

Is there a term for this? Are there slicers that do a better job of it? Is there an open feature request about this?

Basically just wondering if anyone has insight into this, or any suggestions for reading on the subject.

Thanks!

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 2 points 2 weeks ago

I'm using PrusaSlicer, and in PrusaSlicer there is a specific setting for this, which is called "bridging angle." But my point is that bridges are already specifically identified by the slicer as a specific category of print area needing specific settings, and in this case it should be possible for the slicer to choose an optimal bridging angle on a bridge-by-bridge basis, rather than requiring the user to choose a single global angle. You're right that it would be less catastrophic for the bridging to be 45 degrees off than to be 90 degrees off, but it's not obvious why this should be a global setting at all, rather than tailored to the needs of the local geometry of the bridge. It could even be something fairly simple, like just drawing lines parallel to the perimeters of the bridge, similar to what "concentric infill" does. I haven't really looked in to what the best way to implement this feature would be, I'm still at the point of trying to work out how to even describe the issue.