Bolt Stash

Background 
I've seen metal bolts with a hollowed-out shaft and a removable cap before and always wanted to make one myself, but just didn't really have the tool setup to do it.  When I recently printed a clamp for my desktop and looked at the bolt it came with, I immediately thought it would be cool to make a 3D printed version of one of those stash bolts, so I did.  

While I'm sure this has been done before, I did this partly as a learning experience.  I've never created a 3D model before beyond the first few in a YouTube AutoCad360 tutorial I was following, and this is my first attempt at creating a model of my own so go easy on me. :)  I didn't know how to make it a print in place sort of thing, but I think this would be a good candidate for that, so I'm trying to figure that out now.  In the meantime, here's the model.

Printing 
I printed both in PLA at 210c/60c at 50mm/s, with a 0.2mm layer height.

• Shaft: Orient the shaft so that it is open end facing up.  Because it is tall and skinny, a brim is the safest bed adhesion here IMO.
• Hex Cap: Orient this so that it is open end facing up as well, though no bed adhesion is necessary.

Assembly
The threads on the cap and shaft are lefthanded, so that means lefty tighty, rightly loosey.  It is a fairly tight fit the first time you twist it together, but after you've done it a couple times it is smooth.  I added a drop or two of PTFE oil and it works great.  I may need to adjust something in the model that is causing this, but I'm still figuring things out here so if anyone has any ideas I'm all ears.