Confused about 3D print issue.

asterios_anagnostou

Hey all, 

Hopefully someone can help me with this. I designed a seemingly simple thing, but have been having a helluva lot of trouble printing it. 

https://cad.onshape.com/documents/40bbcb7ba9f01f9a069d89ff/w/e14a2eebc4955705fd4a6ef2/e/8f8fb20c5a1b8fb32fd0b130

So what keeps happening is when it prints, there is an portion of it, always shaped the same, in the same spot, no matter how its oriented on the build plate, that keeps lifting off the bed. But really what it looks like is that the printer is screwing up there based on the code somehow, but I'm not sure. 

I thought it might be that because the error follows the part in any orientation. Always from the corner away from the hinge, coming inward across the part.

Looking at the file on onshape, does it look like I screwed anything up? I did toy with adding decals and pictures, but ended up giving up on that. Not sure if I screwed something up in the process.

I'm using an ender 3 s1 pro, ABS, 240/110 and mostly stock settings otherwise.

Any help would be super appreciated and please let me know if you need more information. 


Thanks!

martin_kopplow

Besides printers, if they fail, like to fail on the longest path, when filament flow is at it's limit for the speed given, I doubt the error is in the CAD model, but could rather be some folded face in the STL export. You could change STL export settings to create triangles with lesser aspect ratio and see whether that reduces or confines the problem area.

_anton

This should be printing fine, IMO. Maybe slow down the first layer? It *is* interesting that the defect is independent of orientation. Try a glue stick?

asterios_anagnostou

Thank you guys. I can try some glue.  Martin, how would I adjust the stl export settings in the way you described?

asterios_anagnostou

It's weird, it almost look like it's bunching up that corner for some reason.

_anton

I sliced the model, everything looks fine to me. Is that the corner where the hinge bits are? BTW, you'll want support for those.

I'd recommend:
1. Scrub down your bed with soap and then don't touch it with your fingers. Re-level the bed.
2. Slow down the first layer.
3. Print something very small in that corner, see if the issue is repeatable.
4. Make a long rectangle and print it on top of the problematic area.
5. Make sure your fan is off, I'm told ABS doesn't like that.

MichaelPascoe

I've heard really good things about Magic Goo on Amazon. Supposedly better than a glue stick, but I haven't tried either.

asterios_anagnostou

_anton said:

I sliced the model, everything looks fine to me. Is that the corner where the hinge bits are? BTW, you'll want support for those.

I'd recommend:
1. Scrub down your bed with soap and then don't touch it with your fingers. Re-level the bed.
2. Slow down the first layer.
3. Print something very small in that corner, see if the issue is repeatable.
4. Make a long rectangle and print it on top of the problematic area.
5. Make sure your fan is off, I'm told ABS doesn't like that.

Hey Anton, no its the opposite side of the hinge bits.  I will try a glue. Glad to see that your slice came out ok. What are you using to slice it btw?

_anton

Cura - been using it for years. Annoying UI aside, it works fairly well.

kees_bijker

I have a creality cr10 smart pro and the system is kind of similar. I found that reaching the far corner away from the x origin, the filament could rub to hard inside the filament sensor and maybe it snags a bit.

I never liked the roll on top systems so I converted it to roll on stand next to the printer and I use a small empty reel on the filament stand on top as a guide wheel.

Did you consider the filament could be snagging slightly causing less flow and therefor not sticking to the bed in that position?

Or did I misunderstand and the error moves around the bed depending on how you orient the part?

BTW, your file in on-shape looks fine, nothing wrong with that.