First Prototype
I made my piece in TinkerCAD. I considered using Blender but the other members of the team were using it and it's probably better to keep the software used consistent to ensure compatibility.

The process was pretty simple. I created a simple cuboid shape and used a second cuboid and a triangle shape to subtract from the main part. I set the dimensions and used the align tool to ensure the subtractions were centered. Once each part was completed, we put them together in TinkerCAD to see how they looked.

It looked fine so we did a test print on a 20% scale to reduce the time it'd take to print down to 13 minutes rather than over 2 hours. This really improved our ability to iterate by making it so we could make test prints in a matter of minutes as otherwise we'd only be able to make one a day.

It fit together pretty well but we noticed that one of the pieces was slightly off, the cutout hadn't been centered correctly so while it did fit together, part of the puzzle stuck out on one side.