During my learning process of Fusion 360, I treated it as a personal project. I wanted to challenge myself to design a parametric box that could be safely locked and printed into place without any assembly. This is the result.

The colors in the example photo:

• Prusament PETG: Prusa Orange
• PLA Overture: Green, Space Gray, Orange, Blue-Gray, Purple, Jeans Red

Customize:

I'm still a beginner at Fusion, so I've encountered some difficulties. I tried to add some basic parameter restrictions to reduce errors, but there are a few places that might trip you up:

• This oneCutting angle of the locking mechanismThis can be quite challenging. Depending on the type of filament, layer height, and latch size, you might encounter some latching issues here. Before printing anything large, try doing some small test prints to get familiar with the process first.
• This oneThe height of the outer shellIt must be high enough so that the plane is large enough to accommodate the latch and hinges. You can adjust the latch diameter to compensate for a smaller box. I will keep the latch diameter above 5mm.
• This oneThe external width of the shellIt must be large enough so that the plane is wide enough to accommodate the latch and hinges. You can adjust the width of the latch and the thickness of the latch frame to compensate for a smaller box.

In general, you should carefully check the geometry during the merge, and then check it again after slicing to ensure that everything looks normal.

Available parameters

Radius of the corner in the case

Control the radius of the box corners, and set the minimum supported radius to 0

Chamfering the edges of the case

Control the size of the bevels at the bottom and top of the chassis. This is forced to be less than the corner radius to preserve the geometric shape.

The height of the outer shell

The external height of each half of the box. The total height when it's closed is twice this number. For very small heights, you may need to adjust other parameters.

External length of the case

The external length

The external width of the shell

The external width

Case overlap

Control the "lip edge" of the lower part of the shell. Make sure that other parameters leave enough space for overlapping.

The thickness of the shell

A wall thickness of 2mm is the minimum for small boxes. For larger/stronger items, you'll want a higher price.

Hinge diameter

Control the diameter of the hinge ball socket. 5mm is a fairly safe minimum value, depending on the adjustments of the printer.

The thickness of the hinge

Control the thickness of each hinge and ensure that it is thick enough to be consideredHinge diameter.

Cutting angle of the locking mechanism

Control the tightness of the buckle mechanism. Depending on your material and printing settings, this might be quite challenging. The lower the number, the tighter it is, and the higher the number, the looser it is. Adjust it as needed.

Locking buckle diameter

Control the diameter of the ball joint that locks the latch. A diameter of about 6mm is usually sufficient, and it can even be as low as 5mm, but that would make it weaker. A larger diameter will be stronger, but it will also take up more space.

Hanging lock holder

Control the overhang of the latch mechanism. For most printers, a 45-degree overhang is safe. If your printer is well-adjusted, or if you don't mind using a support structure, you can adjust it to a shallower angle to reduce the height of the enclosure.

The thickness of the door lock frame

Control the thickness of each side of the latch frame.

The width of the locking mechanism

Consider the width of the latch itself when controlling it.The thickness of the door lock frameAnd determine the tolerance of the total width of the entire locking mechanism.

Tolerance

Control the spacing between various individual objects. 0.3mm works well on my printer, but it should be adjusted according to the settings of your printer.

Instructions

1. Download and install Fusion 360 - it's free for personal use.
2. Open the latching_box.f3d file
3. Open the "Edit" menu and select "Change Parameters".
4. View the parameters in the menu and read the notes explaining each parameter
5. Modify the parameters to meet your needs
6. View the model in Fusion 360 to ensure there are no issues or warnings
7. Right-click on the root component in the browser, and then select "Save as Grid".
8. Save as the preferred format
9. Slicing, checking, and printing!

Note: If you have any questions, please feel free to contact me at any time. I'd be happy to help with debugging. This is my first large-scale Fusion project, so I expect there might be some rough edges.