This is a fairly simple design of a Jedi Holocron. It is made up of 24 parts using proper metric threading with tolerances in-place for printing. I designed it specifically for FFF or FDM printing using a 0.4mm nozzle. I have printed this on my Ender 3's using both PLA and PETG and they turned out great. They can also scale nicely (I have done 150% easily and can do up to 200% with my Ender print beds). All of the parts will need to be aligned for printing and most will need some level of support.

This Holocron has room inside of the core to store whatever secrets you want to pass on to future generations. Or maybe just your house key. Itlooks great and holds together well when printed well. The core parts have impressions in them that the base parts and caps will fit into, and the base parts and corner parts are numbered for ease of build. While I haven't been able to print this using an SLA printer, I would imagine it should also turn out great that way. I have also included the fully built STL file with this, which while it has the threading and such, will likely not come apart if printed that way. I've included images of the orientation I've used when printing these parts. I recommend a 20% infill and I personally print using rafts just because it makes for the cleanest parts.

For reference sake, the core printed at 100% can hold just over the capacity of a standard tennis ball. When printed at 20% infill in PETG, the cube weight just over 1 lb, though when printed at 10% infill in PLA, it was significantly lighter as can be expected. I've included a reference photo with an Anakin Skywalker lightsaber (official 1:1 prop by Master Replicas) to help you reference the size. The cube, when assembled, is just over 100 cubic mm, or just under 4 cubic inches.