Fully Parametric Closet Hook for Backpacks (w/ OnShape & Fusion 360 support)

I wanted a way to finally hang up all of my backpacks, but it seemed like every other option out there was designed with specific closet rods and/or backpacks in mind, and either the dimensions were wrong for my purposes and no CAD was provided, or the CAD that was provided would have required me to re-modify every single value for each hook. 

So I made one where every single dimension (seriously, even the filets) is calculated from two data points:

1. The diameter of the closet rod you are hanging things from
2. The width of the handle of the item you are hanging up

That's it. Everything else is automatic, and you can download the exact step file for your purposes.

How to use this:

OnShape

1. Go here:

https://cad.onshape.com/documents/a7438c928d82aa1d594f2b56/w/c5b46034a2929d5c3440978a/e/061c730f23324eeb2213fd57?renderMode=0&uiState=671ab6e756151d71a03d4443

2. Open the variable table:

3. Update the [bag_handle] and [closet_rod] variables with your desired values in millimeters

NOTE: Do not change the [filet_radius] variable. That one is calculated from the [bag_handle] and [closet_rod] variables.

4. Download/Export:

You can export this with whatever settings/formats you see fit. Step if you want to keep a solid file around. Or just go straight to a 3MF shell if you like. Completely up to you, but no matter what you'll have a fully customizable closet hook.

Fusion 360:

1. Open the F3D file in Fusion 360

2. Edit the variables as desired, via Modify>Change Parameters

In the Change Parameters tool, edit the User Parameters “bag_handle” and “closet_rod” as desired. Do not edit “filet_radius” (unless you're feeling frisky; you do you, but filet_radius is calculated for you)

3. Export a STEP or STL or 3MF, depending on your preferred 3D printing slicing workflow

Note: Either the “Export” or the “3D Print” tool will let you export a point cloud mesh, however the 3D Print tool gives you more control over the mesh generation, as well as file handling post-export (either saving the file or sending it directly to the slicer of your choice)

Why use this model over others?

Aside from being able to customize the dimensions easily? Well, as part of the dimension customization, the center lines are always kept aligned with one another, thanks to the parametrization, so it will stay hanging vertically no matter what you hang from it. For example, the “Bag Handle Guide” sketch functions as the ‘control’ for the “Bag Handle Sketch” sketch, which is what Extrude 1 is generated from:

And every single value in “Bag Handle Guide” is calculated from the variables #bag_handle and #closet_rod:

Extrude 1 is also generated from the #closet_rod variable, as well.

And all of the same principles apply to:

• “Closet Rod Guide” sketch
• “Closet Rod Sketch” sketch
• Extrude 2
• Filet 1

So a change in hook dimensions is as simple as going from this:

To this:

Supports are also kept to a minimum, thanks to its shape. It is really only the closet rod hook itself that requires any kind of supports, and they are minimized just in general:

Print Settings:

• Really anything other than PLA should be fine. PETG should work for 99% of you, and the only ones that should need something like ASA or ABS would be those who are hanging something up in the sunlight.
• I also strongly recommend that you use whatever your “structural print” profile is. Mine typically looks something like:
  • 4 or more perimeters
  • Gyroid Infill, 30% or greater
  • Layer height between 0.2mm and 0.1mm (0.15mm layer height is technically the strongest, fun fact)
• Finally, I recommend printing it oriented like it is shown in the gcode. It does not automatically orient itself this way in exports from OnShape because I modeled it in the same orientation as it would be hung. But laying it down as shown accomplishes two things:
  1. Keeps supports to a minimum
  2. Orients the layer lines parallel to the forces being applied to this hanger, maximizing the strength of the printed part

Hope you all enjoy this part!

Change Log:

• 2024-10-24: Initial Release, w/ OnShape support & STEP files
• 2024-11-28: Fusion 360 support added via F3D archive