Plastic Snap In Plugs

I had some holes that I had drilled into plastic containers for spooling systems.  I no longer use these spooling systems.  I wanted to seal these holes up, not to an air tight level but well enough to stop dust and insects so I could reuse the containers for storage. 

These little plugs are printed from PLA and if you size them for the hole correctly they just snap in.

I have them sized from 11mm to 13.5mm holes with 1.5mm thickness of plastic for the container's hole.  But the FreeCad file lets you make them for any sized hole you need just by changing the numbers in the spreadsheet.  Almost no FreeCad expertise required and FreeCad is free.

I have these in 4 containers and they work really well, tricky to get out once you put them in.  The containers remain stackable inside one another when empty.

I used spare cheap PLA with 15% infill regular perimeters and 0.4mm nozzle.  I printed these on a Prusa Mk3S+ and each plug took approx 23 minutes. The design when printed with the barb facing up seems to manage the overhand of the barb quite easily which really surprised me.