A simple box to hold screws, bolts, nuts, pills, jewelry, whatever you desire. The lid snaps on and is hinged. No hardware is needed for assembly. The lid also snaps closed. It's secure enough that it can be turned upside down when full of bolts, but I wouldn't test it too much. The box is designed to use minimal filament, so the walls are 0.8mm or 1.2mm thick (depending on the option you choose).
If you want a box designed to a specific size or a certain number of sections, just leave a comment, I would gladly create one for you!
V1: The box has 16 sections (4 columns and 4 rows), and each section is about 30x40mm (minus the thickness of the walls, so closer to 29x39mm). For a box size of 160mm x 120mm. There is an option that has spots for labels, if you want to label your bolt sizes. Labels would need to be smaller than 9x22mm.
V2: Redesigned (though nearly identical to V1) so values are easily changed with parameters. This allowed me to make many sizes, with many different numbers of sections. Currently available sizes: 100x50mm, 100x75mm, 125x75mm, 150x100mm, 200x125mm, and 225x150mm. Some sizes are available in different depths, including 20mm, 25mm, 30mm, or 35mm. And all sizes have many different options of sections, from a 2 columns and 1 row, all the way to 7 columns and 5 rows. Some have larger rows, for different sized sections. Sorry for the wall of files this creates, Thingiverse doesn't seem to allow organization of STL files or folders. Let me know if there is a size you want, or a different count/arrangement of sections. I will create it for you.
PETG or ABS is recommended as these materials are a bit more flexible, allowing the hinge to snap in more easily and the lid to snap onto the box, but also being strong with thin walls. Though it should work in PLA. I printed the 0.8mm wall in PETG, and while the walls are slightly flexible, they are plenty strong for the purpose of holding bolts.
Adaptive layer height works great on the box, I used 0.16-0.32mm, and it cut about an hour off of the print time, while still getting fine details where it was needed.
With a low infill % (less than 25%), it is best to use a 3D infill, since you want to guaranty some infill in each of the corners between the sections, though infill is not needed across the entire height of the box.
You can also disable "fill in gaps between walls" to save a little more time, since the only gaps should be near the section corners, which don't need any additional reinforcement.
Greater than 1mm wall thickness is recommended to improve the strength of the hinges (3 wall count with a 0.4mm nozzle).