3DPrinting

15629 readers

294 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: [email protected] 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 1 year ago

MODERATORS

[email protected]

121

Sometimes fewer walls are better (sh.itjust.works)

submitted 9 months ago by p1mrx to c/[email protected]

20 comments fedilink hide all child comments

I think I found a counterexample to the common wisdom that more walls always create a stronger part.

The pictured S shape is 1.5mm thick, so printing with 2 walls leaves no room for infill. My testing wasn't very rigorous, but it seems that the hybrid structure of walls + rectilinear infill is 10-20% more rigid than walls alone. The infill adds strength by cris-crossing between adjacent layers.

I think it's fine to include a concentric top/bottom layer, but multiple identical layers weaken the part. I also tried 0 walls (infill only) and that was garbage.

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

[–] [email protected] 2 points 9 months ago (2 children)

The 1 walled hook has the infill resisting and pulling back as you try to straighten the hook. When it fails, some of the connections between infill and walls break, causing the hook to lose it's form or original rigidity permanently. In the case of 2 walled hook, this damage should be less severe, making it more durable.

[–] p1mrx 4 points 9 months ago* (last edited 9 months ago)

Okay, but if my 2-wall hook bends into a straight line, then I don't really care about the durability of that no-longer-hook-shaped object.

Edit: I agree that 2-wall could make sense, if your goal is to reuse the hook (with a more appropriate load) after the heavy load falls off. That's analogous to protecting a wire with a circuit breaker.

[–] [email protected] 0 points 9 months ago (1 children)

The 2 walled hook is closer to solid plastic too, which should give it the most bonded surface area per layer and make it stronger overall.

[–] [email protected] 2 points 9 months ago (1 children)

The bond between layers or the walls is a lot weaker than just solid material.

[–] [email protected] 1 points 9 months ago

Sure, but stronger than just infill to walls.