On 10/20/2023 at 4:34 AM, Slashee_the_Cow said:The maths aren't quite as simple as you tried, because you need to take into account the volume of filament (including layer height) and not just width.
I may be doing it wrong, but I tried doing the math again with volume and got the same result.
Edit
Sorry about the double post, I meant for that to all be in one
Edited by osterac
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Slashee_the_Cow 541
First: probably more appropriate here than the GitHub repo. That's more about reporting bugs, not asking for help.
Changing the material flow can cause it to make walls thinner (because wall thickness is basically controlled by the amount of material that is usually just laid down on top of existing material so will expand to adhere to that). The maths aren't quite as simple as you tried, because you need to take into account the volume of filament (including layer height) and not just width.
If you want, you can change how closely the walls are printed with Bridge Skin Density. This can be reduced so it will print walls spaced further apart (which can help them cool faster to try to avoid sagging by not printing hot wall next to them straight away) or increased so that it tries to print more lines, closer together (so they'll adhere to each other). But it won't print them any thinner or thicker.
I've personally never had a problem with adhesion of .4mm lines using PLA, excluding shonky PLA (though the worst adhered fine, it just destroyed my printer in the process) but I also probably don't have the exact PLA you have and it's not always one size fits all (especially with the silk PLA, because that usually has added ingredients to make it silky).
Two notes about bridging though:
1) You probably want to do it a fair amount faster than 15mm/s. The auto calculated value in Cura is based on your print speed setting. But the longer it takes to get from support to support (in this case the walls) the more time it has to sag before it gets there.
2) I hope that's just a proof-of-concept model, not one you want to actually try and print. Someone is bound to prove me wrong, but I'd be very surprised if you could bridge 5cm over nothing whatsoever with silk PLA even in ideal conditions.
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osterac 1
Thank you, this post is very helpful. One problem I've had trouble with is getting the bridge wall to adhere. This is the absolute best I've been able to do:
Even if that's the best I can expect to do with silk PLA, what settings would make the bridge wall adhere better (in general)?
I didn't realize silk PLA performed so much worse. I suppose it depends on the brand, because I have had much better luck with other silk PLAs. This one (Amolen dichromatic) has been a real pain.
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