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[SOLVED] Any ideas what causes this in overhangs? (lemmy.world)

submitted 5 months ago* (last edited 5 months ago) by [email protected] to c/[email protected]

13 comments fedilink hide all child comments

When I do an overhang test, I always have this problem at about 35°. Does anyone have a suggestion what could be causing it?

Slicer: Orca
Layer height: 0.2mm
Infill: 0% (this has improved it a lot, I think the infill was causing bulging)
Outer walls: 2
Overhang speed: 10 or 20mm/s (both look the same)

Solution: I mistakenly thought overhang speed in Orca was based on overhang angle, it is percentage instead (which makes much more sense for different layer heights). My 10-25% overhang speed wasn't set to slow down and that must translate to about 35° at 0.2mm layer height. I now have it set to 30mm/s and it now looks great 👍 And sorry, I was wrong when I stated the overhang speed 😅

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[–] [email protected] 6 points 5 months ago (1 children)

Seems like lowering your hot end temps or increasing cooling would do the trick

[–] [email protected] 4 points 5 months ago (1 children)

I came here to say augment the print temperature! Look at those non binding "tubes" that are laid down every layer! They should melt into each other or it's just crap and they'll break under their own weight.

Upping the fan is not needed here (yet, see below). It's good when doing overhangs or printing without support and stuff start to sag down. When anything sags down probably :-)

So up the temp for the overhangs, if they become too "liquid" then up the cooling(so fan speed).

[–] [email protected] 3 points 5 months ago

Thanks guys. I will try both and see what works. My layer adhesion is good / parts are strong though.

[–] [email protected] 3 points 5 months ago (1 children)

Looks like drooping to me, I would see if lowering nozzle temp improves/solves this

[–] [email protected] 1 points 5 months ago

Thanks, I'll give it a go.

[–] [email protected] 2 points 5 months ago (1 children)

Looks like the deformation is happening on the same layers where the overhangs of the number 35 are.

[–] [email protected] 3 points 5 months ago (2 children)

It starts just underneath actually, but it still could be related 🤔 Maybe I need a test without numbers.

[–] damium 4 points 5 months ago (2 children)

If 35° (or something close to it) is the slicer setting for overhang detection it likely changes the cooling/speed/flow settings. If that is the case you can set it to a lower detection value and maybe get better results or change the normal cooling/speed/flow to be closer so it isn't as drastic of a change.

[–] [email protected] 2 points 5 months ago

You may actually be right even though I thought I had checked this. Orca's overhang speeds are based on overhang percentage and not angle, I previously just looked at the number and assumed it was degrees 🤦‍♂️I will match the speeds for all overhang percentage ranges and see if that solves it 🤞

[–] [email protected] 1 points 5 months ago

This was it! I had my 10-25% (not degrees 😅) overhang speed set not to slow down at all. I now have it set to 30mm/s and I have a perfect result. Thank you 👍😁

[–] [email protected] 1 points 5 months ago (1 children)

I believe that if your layers are printing fast enough, the softer material would bend according to where the top layer is printed.

[–] [email protected] 1 points 5 months ago (1 children)

Sorry, I didn't follow that. Top layer of what? Not the actual top, top layer right?

[–] [email protected] 2 points 5 months ago

I meant, the next layer directly on top of where your deformed layers begin.