red104
Posts: 4
Joined: Thu Jun 15, 2017 2:44 pm

Possible overheating - sagging/drooping on overhang

Hello Everyone!

Printer: Flashforge Creator Pro
Filament: ColorFabb PLA (1.75mm)

Was printing the 3DBenchy Boat (https://www.thingiverse.com/thing:763622) and was getting some filament drooping/sagging on the overhang. The overhang angle looks like it's around 30 degrees, so I figured I could handle that (I have yet to benchmark the overhangs, however :D). Here are some pics:
Image
Image
Image
Image

Here's my factory file:
https://drive.google.com/file/d/0B_aAJ4 ... sp=sharing

The photos above depict the model printed with the "Fast" quality configuration.

What I've tried so far:
Print speed: From 60mm/s to 55mm/s. Didn't see any improvement.
Upped to "Medium" print quality: Reduced layers that sagged, but issue was still prevalent.

My nozzle temp of 200c is fine - I've done some testing to remove 'zits/blobs' and I've found that printing at 200c works for me for this particular filament.

What I am thinking:
  • I really think this should print without supports better than what I am seeing here.
  • Do you think printing slower would help, or does this not apply?
  • Could the bed (50c) be causing that overhang to droop? The overhang starts to droop at approximately 3mm from print bed.
Thank you!
brian442
Posts: 1243
Joined: Mon Nov 28, 2016 5:35 am

Re: Possible overheating - sagging/drooping on overhang

Lower the outline underspeed and decrease the layer height. Those will both help with overhangs.
wirlybird
Posts: 1374
Joined: Sun Jul 17, 2016 1:32 pm

Re: Possible overheating - sagging/drooping on overhang

Yes, print slower and give thing time to cool.
red104
Posts: 4
Joined: Thu Jun 15, 2017 2:44 pm

Re: Possible overheating - sagging/drooping on overhang

Thank you for the replies everyone. I printed off a new fan duct (https://www.thingiverse.com/thing:1675208) to help distribute air flow towards the nozzles, and that did it!

Image
- Medium settings

Overhang came out great. Are the zits/blobs shown in the image something that I can fix, or is this something I'll just have to live with?

https://www.simplify3d.com/support/prin ... s-and-zits

Can changing my retraction settings really help?

Thank you again!
Kurz009
Posts: 7
Joined: Mon Feb 27, 2017 6:57 pm

Re: Possible overheating - sagging/drooping on overhang

For me, enabling coasting fixed most of the blobs. I would suggest enabling that first at 0.2 mm and seeing if it helps/fixes the issue.

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