Made an air mattress plug this week.

Over a year ago we lost the plug to our air mattress. A couple weeks ago my wife says to me "why don't you print a new one?" And so I have.

Took a few tries to get the thread right for the one way valve (24mm outer diameter, 30° pitch on the thread at 13 turns per inch). I then copied that thread model, reduced the diameter it for the inside thread and then reduced it some more for the plug.

Added a rubber flapper and some O-rings.

Inflated the mattress and now we wait and see if it holds air...

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/4JBuUCyGZA1

Remixed from a threaded rod from http://www.thingiverse.com/thing:193647

Printed at 0.149mm layer height in PLA with 10% infill. Not convinced yet that the final print is 100% air tight.

O-rings and rubber sheet added to ensure seals.