Summary

I wanted a salt shaker that wouldn't spill for the car and I couldn't find one that suited me. So I designed this one with a rotating cap.

It is designed with quite large tolerances so you shouldn't have any problems with assembly.
t prints without supports. Assembly should be obvious. The only tricky bit is the cap retainer. It can be fixed in place with glue or a 3mm screw. It should only be tightened enough to keep the cap snug. The retainer has a hex section to keep it from loosening the screw or weakening the glue when the cap is turned.

As with any print used with consumables, you should use food-safe material in printing and assembly.

The CAD files are available on Onshape