This model attaches to cheap timers you can buy by the dozen.
It allows the timers to hang on gym equipment to stay off the floor, or to be placed on the floor at a slight angle.
It takes an optional 15mm x 2mm magnet. I say optional because there's a clip that also holds the timer in place. The magnet was a backup in case the pins wear out from use. The reality is that once it snaps in, usually people don't remove it so it almost never wears out.
I used these:
https://www.amazon.com/gp/product/B0BM5TFLFX/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
It prints with the long side flat against the bed. Two part print is great so you can adapt it to your gym equipment and won't require supports. Also allows customization like adding logos. You can print it standing, but not as nice and will require supports.
I attached using superglue. If you print with ABS (I did for the final batch but saw no real difference, you can use superglue or plastic weld).
The Dr. says 30 min of excercise twice a week is important. You got this!
The author marked this model as their own original creation.