Layer time, most likely. You can avoid it by setting minimum layer time higher. When the curvy part is being printed, it takes longer for that layer, so it gets to cool down more before the next layer, in contrast to still being a bit hot before the next layer if the layer time is short. This causes unevenness in the looks a bit. You may also decrease the effect by lowering the printing temperature, but I would not recommend it. Also, part cooling fan can have an effect as well.
That makes sense, thanks
Off topic but I’d recommend printing this stand on its side vs the back.
In its current orientation the stress would be dispersed directly against the layers and it’ll be more prone to break.
If you print it in the side it’ll spread the stress across multiple layers. The annoying bit would be the need for supports on that split.
For the lines you could try a fuzzy texture.
That makes sense, thank you. I still added supports for this orientation under the top end of the curve. It was originally designed to print on the bottom, but I changed it this way because the original orientation needed too much support. I should have printed it on its side.
not the original commenter, but it always amazes me how strong a 3d print can be if made considering the layers orientation, and how weak when I don’t
It’s something like 5× stronger in the direction it prints than across layers, with great adhesion. It’s even worse if your adhesion is lower.
I bet on more cooling due to shorter layer time in that area. Maybe the fan is blowing harder, check your cooling fan settings, and minimum layer time.
Chiming in to say: in that print orientation the weight of your device is putting stress on the weakest part of the print — the layer lines. Something to be aware of.
It’s hard to tell from the photo what the issue may be. It looks a bit like over-extrusion but I’d put my money on highly reduced layer print time causing the fan to ramp way up and getting more shrinking.
I would guess it’s a timing issue; since the layers on the front part take longer the back part has longer to cool and shrink in relation to other layers. Maybe a draft is increasing this effect - do you print in an enclosure? If yes, maybe a setting a minimal layer time might help - that way all layers have an equal amount of cooling time.
It looks like it’s in line with some features where very little filament is used. This is either a layer time issue, or a retraction issue.
Increase / decrease infill/wall overlap % seems like the best advice I found while googling.
Imo printing on edge would fix it and make the print stronger but that could require changes to the model / printing with supports.
It’s difficult to tell height and things lining up in the photo - if it’s all over the part it might also be feeding issues or ringing. If it’s ringing check how sturdy the platform your printer sits on is or decrease printing speed. What machine are you using with what settings?
