This is a modular Altoids tin storage system. Print as many modules as you have tins and then stack them up horizontally, vertically or both. The modules can be mounted to vertical surfaces using the screw holes provided.
There seems to be very little advantage to printing these with finer resolution so go for the speed and use ~.350mm. I printed these with 4 perimeters because I wanted the locking nubs to be 100% filled in. As for actual infill, it really doesn't matter. I used a 20% grid but just about anything will work.
There are two STL files. Both are essentially the same, but one has corner tabs for ABS printing (for improved bed adhesion.)
If you used the ABS file, remove the corner tabs. An sharp x-acto knife can help with this.
The modules slide together to form whatever sized rack you need/want.
The mounting holes are designed for #6 hardware. They should also work for M3.5 hardware.
The closeness of the Altoids tins in the rack can make the tins hard to grab. Just push in on one end of the desired tin. The opposite end will push out, making it easier to grab.