This is a proof of concept that I found useful for Virtual Reality Full Body Tracking using the HTC VIVE trackers. The mounts are fitted for a US 10 sized Nike Metcon4 shoe. It may fit on other shoes as well with similar lace spacing.
For a more secure fitment, fasten with zip ties. The Tracker is held in place with a 1/4-20 Thread Screw. I used a D-Ring Hinged Screw found here: https://www.amazon.com/gp/product/B009FILPMU/ref=as_li_tl?ie=UTF8&tag=becauseweca0d-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B009FILPMU&linkId=fefa251a59f8a362e7e7186ee7a53c90
You can buy them without the hinge if you want but you need that part to fasten the tracker to the adapter.
It took my about 12 hours to print both in one go on a ender 5 plus with max speed settings at 50 mm/s. The supports were not too hard to get rid of but you need to be gentle.
I wanted to design an adapter that wouldn't hurt my feet like some of the other designs I found on Thingiverse and around the web. This accomplished that goal and ended up being more secure than other prints I had tried.