I am creating a bottlecap-like design. The design is sealed by rotating the lid. I am adding a chemical to it for an experiment. I would like the inside of the design to have no air circulating to it through the lid tiny spaces.

My design:

enter image description here

Are there any simple solutions I can implement out there? Design-wise, material-wise, or maybe an extra piece?

  • $\begingroup$ Are you talking about sealing design or porosity of the objects when printed (it looks like the final sentence above the image hints to that)? $\endgroup$
    – 0scar
    Apr 24, 2021 at 6:29

1 Answer 1


Are there any simple solutions I can implement out there?

A gasket made of rubber or other elastic or deformable material is probably the best option. Printing one or both of the parts using a deformable material like TPU might also work. Finally, if you don't need to open the unit during the experiment, you could use a sealant like silicone caulk might make sense.

  • $\begingroup$ Or a garden hose o-ring. $\endgroup$
    – Davo
    Apr 23, 2021 at 17:25
  • $\begingroup$ @caleb How about the air that is in before it is closed. is there a way to force it out? $\endgroup$ Apr 24, 2021 at 1:38
  • $\begingroup$ @AnwarElhadad You could fill and close the device in an inert gas environment, like nitrogen, CO2, or argon. Or you could add a valve that lets you pump the air out after filling. I’m not sure that a FDM printed part would hold a vacuum — you’ll need to test that and perhaps take steps to seal the inside. $\endgroup$
    – Caleb
    Apr 24, 2021 at 19:20
  • $\begingroup$ Thank you. I will try $\endgroup$ Apr 25, 2021 at 17:15

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