Posts: 3
Joined: Mon Mar 15, 2021 4:19 pm

Refusing to add support beneath

Thu Jun 10, 2021 5:26 pm

I don't know what else I can change in the support settings, but I keep getting issues with models where Simplfy3D refuses to add support in obviously needed places (the entire bottom side of the model in the attached photos).
Screen Shot 2021-06-10 at 2.16.09 PM.png
Screen Shot 2021-06-10 at 2.16.06 PM.png

Posts: 138
Joined: Fri May 18, 2018 11:13 pm

Re: Refusing to add support beneath

Fri Jun 11, 2021 11:14 am

Check your bridging settings.

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Posts: 2366
Joined: Tue Mar 10, 2015 4:09 pm

Re: Refusing to add support beneath

Fri Jun 11, 2021 1:55 pm

Nothing to do with bridging settings, I'm afraid!

The auto-generation of supports is dependant on the combination of the bottom-facing area and width of the part and the settings used. Needless to say that in this case, the algoryth is not finding sufficient downward facing area per unit bed size to positively determine ithst support is needed.

Without any further information, I'm unable to help further......

Please supply a Factory file for this part.....and I'll be able to explain exactly why supports are not being auto-generated.
Doug Kightley
Volunteer at the National Tramway Museum
Railway modeller and webmaster at

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