Summary

I already have a Spice Jar project (https://www.thingiverse.com/thing:94932) but I've been thinking about this simpler design with just two parts. It's easy to print.

Stuff pours from the side of the jar. The top turns to select the proper holes.

After filling the jar, push the top down onto the jar. It sorta snaps into place. To remove the top, wiggle it while pulling upward.

It works fine with salt... Might work with pepper too.