There are not a lot of functional prints for women on Thingiverse so I thought it's a good area to try and make a contribution.The only tampon holder on Thingiverse is described as a "joke" :-/ I know the Maker community is very conservative but these are essential items that almost all women use. So it seemed to me we should have at least one here.
This is not the most space efficient design ever, but it's better than your tampons falling out of that flimsy box and tumbling around in the bottom of your bag. It's also a whole lot of fun to load up like an action heroine when feeling otherwise blah. You can even use it with one hand- leaving the other hand free to fight off villains! Really, really inconsiderate villains with terrible timing haha...
The magazine fits six OB Pro Comfort "Normal", or any 13mm x 52mm tampons. It should scale cleanly to fit any tampon the same approximate shape. The TinkerCAD model is here it you'd like to add text or decorations to it: https://www.tinkercad.com/things/gnOJgQYpBFs-tampon-magazine
The spring slides into the bottom plate. That assembly then gets inserted in the magazine and secured with a little superglue. I use superglue and PLA on almost all my prints and it works great, just make sure there's a good fit with no gaps and you only use a tiny tiny bit.
I made a short YouTube video showing my 3D printing workflow and instructions for assembling this print: https://youtu.be/ugxOl6tMnM4 It's my first build video and I'm a bit awkward so I'm not sure how useful it will be.
Two shells, four top and four bottom layers seems to work ok.