One of the best waterproof box !

Import from https://www.thingiverse.com/thing:4838803

The cam-latch closure is the toughest 3D printed box closure you can get.

Features:

• Cam latch
• TPU printable seal
• Can be sealed with silicone instead of TPU
• 6 sizes
• Parametric Fusion 360 archive
• STEP file
• Optional lanyard loop
• Optional filled body stl - generate your own internal cut-out in Meshmixer

Requires 8x M3 x 20mm screws.
Tested in PLA and PETG, should work with any rigid filament.

Post-Printing

Print Settings

Printing the box :
I recommend 3 perimeters to improve the strength of the walls. Use 5 or more top and bottom layers to ensure it is water tight, and at least 30% infill to give the bottom and top strength. Both PLA and PETG work well.

Printing the latches and hinges :
Use three perimeters and >30% infill. I recommend using PETG, but I also tested PLA. PLA works fine after printing, but there is a risk it will creep over time, making it looser and degrading the quality of the seal. I suggest printing both the provided sizes at first, so you can decide how tight/loose you want the closure to be.

Printing the o-ring :
The challenge here is making sure it is compliant enough to form a good seal. I used TPU with 1 perimeter and no infill, (there is a cross section photo above). Make sure you are not under-extruding, or water could leak through the printed seal itself. A very smooth bed, such as glass, will help get a good seal.

Assembly :
Orient the hinges and latches according to the cross-section images, be careful to line up with the hole in the latch and the hole on the opposite side. If you are using an electric screwdriver, go slowly or you might melt the holes with friction. I recommend installing the seal with the domed surface (top) facing into the groove, and the flat surface(base) exposed.

All fusion360/STEP files are available to customise your model size ! :)

Box preset are available too !

Thanks to zx82net for this design :)