The 3D design was developed in TinkerCAD and an editable design is available here:

https://www.tinkercad.com/things/gPan0GUSNkd

Please don't judge us! This device went though a very iterative design process so the current design build is a bit complicated.  We'll hopefully re-design this more simply and update in the future (or if someone does this please let us know so we can post better design files!).