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CREATING GASKETS AND SEALS FROM DESIGN

I am new to Onshape and CAD in general. I am using it mostly to create 3D printable models. I was wondering if there was a simple way to create Seals and Gaskets for my models or do I have to design them into my Part studio designs. Sorry if this doesnt make sense, and thanks in advance for any help.
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Assuming you want to print the seals as well (with TPU?), I would use the "thicken" feature (with the "new" option). Then maybe use a "move face" to create clearance if needed.
If you want to use standard O-rings, then you have to size the feature to match the features so they work with available orings.
For O-ring seals, Parker-Hannifin and Apple Rubber have good, downloadable design guides with very detailed info.
Yes, I should have mentioned with TPU. Thanks for the quick reply.
Click the faces you're pointing at and just use the Extrude or Thicken features. If you're printing them in a multi-material print then you're done, otherwise do as Eric suggests and add clearances with Move Face.
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