A simple keychain of a running shoe. Modeled using a picture of the Adidas Duramo SL

Here is a similar model of a Saucony running shoe that I made.

Slicer instructions:

The STL has 5 different parts (bodies). You can customize the slicing of each part, but I would recommend changing the one I used like this:

PrusaSlicer:

-Open the .3MF as a model.

-Now right click the correct part and click ‘Infill’ and ‘Layers and Perimeters’ at the bottom of the menu.

-You can now edit the object settings as seen in the bottom right of the picture below. Change the fill pattern and density to your own liking.

Cura:

-Open the .3MF as a model.

-Click the area of the shoe that needs to be changed and select ‘Per Model Settings’ in the menu on the left.

-Click ‘Select settings’ and in the new window, select (at least) the four settings you see in the picture below. Change them all to 0 and select your favorite infill pattern.

Enjoy!