What’s the recommendation to fix under extrusion? I tried changing the flow in cura to 102 then later to 118… no obvious differences.
Comment on I'm doing something wrong; can't print this PETG
IMALlama@lemmy.world 1 day ago
You’re severely under-extruding. This may sound weird, but try a warmer temp tower without any extrusion. You might be developing a clog mid print.
csm10495@sh.itjust.works 1 day ago
IMALlama@lemmy.world 1 day ago
PETG isn’t very tolerant of too much retraction. Given your fine first layer I suspect you’re developing a clog as the print goes on, which would result in under extrusion. Turning retraction completely off will make it very easy to rule out as a possibility.
csm10495@sh.itjust.works 22 hours ago
What should I see differently with retraction off? Like it failed but what should I look for then try next?
IMALlama@lemmy.world 19 hours ago
Did it look more solid or did print quality basically remain the same?
GrayBackgroundMusic@lemmy.zip 1 day ago
Upping the flow isn’t the problem then. In my experience, flow only ever varies between 95 and 105%. It’s there to compensate for thinner or thicker than expected filament. The under extrusion is caused by something else. Possibly a blockage, possibly to much drag. Pushing harder, aka more flow, might not help.
CrazyLikeGollum@lemmy.world 1 day ago
How can you tell it’s under extruded?
@PostnataleAbtreibung@lemmy.world said the same thing in an earlier comment.
If there’s some clear sign of under extrusion it might be useful for my reference doc I use when trying to troubleshoot failed prints.
IMALlama@lemmy.world 1 day ago
IMO this is the same as any other hobby. Print enough and you’re likely to run into under extrusion at some point. Similarly, I can tell if doughs and batters needs more liquid or more flower by look and touch thanks to making a ton of pizza crusts and pancakes.
The first photo in the album looks like ‘classic’ under extrusion. The layer lines are largely intact, but way less material that is necessary for a solid print is present. The print has better and worse areas, which usually indicates a clog. Combine this with the fact that PETG will clog if you use too much retraction and a user that’s new to PETG and retraction seems like a good place to start troubleshooting.
As for helping your guide, simplify3d hasn’t been a ‘cool’ slicer in quite some time but they have a decent print quality guide that names a bunch of failure modes. Ellis’ print tuning guide is the best one I’ve come across.