Submitted 8 months ago by mooklepticon@lemmy.zip to 3dprinting@lemmy.world
https://lemmy.zip/api/v3/image_proxy?url=https%3A%2F%2Fi.postimg.cc%2FC5677Tng%2F20250709-093419.jpg
First PETG 3d print in a while. Main body seems fine but overhangs are not. Unsure why. Need to investigate. (it’s a phone stand, the central portion swings out and makes a triangle, holding phone in that curve.)
Overhangs are always difficult in 3D printing and your part cooling fan makes a huge difference in this. Also your print speed and temperature are factors.
This model however can also be printed sideways, you’ll have lower bed adhesion but it won’t have any overhangs this way.
Just add some or more fan on overhangs, petg looks much nicer that way ( worse layer adhesion)
Have you dried your petg recently?
I find PETG varies a lot. First thing I always do to troubleshoot is print same thing in pla to see if it’s a material issue or not. If so, try temp towers with that spool to see what temp gives you best overhang. I have a blue PETG that looks just like that, and in my experience those cool translucent PETG spools are more finicky then matte finish versions for some reason too.
Assuming prusaslicer, go to print speed settings, and look for “slow down on overhangs”. Also, under filament > cooling, there’s an option to increase fan speed on overhangs.
You can use the top left menu on the layer view to check that the fan and print speed are actually adapting properly to the overhangs.
I’d print it on the side, will make it stronger anyways. Less likely to lose layer adhesion
MysteriousSophon21@lemmy.world 8 months ago
PETG usually needs some cooling for overhangs but not too much - try 30-40% fan speed just for those sections while keeping it minimal for the rest of the print to maintain layer adhesion.