Hey! This thing is still a Work in Progress.
Files, instructions, and other stuff might change!
Inflatable mattress plug - 3 sizes
Description
This can be used to plug the valve holes in most inflatable thingys.
Three sizes.
Three sizes.
Instructions
Three sizes of plugs to plug something, like a inflatable mattress or wife.
License
Inflatable mattress plug - 3 sizes by wictro is licensed under the Attribution - Share Alike - Creative Commons license.

rubber should be very possible to print, as natural rubber is easy to make liquid-like with solvent!