Nothing fancy, simple, and it works great. Holds 4 ounce plastic cups, associated lids, and mounts to your fridge! I've also added a 2 oz version (identified in file name)!
Mounts with two 60x10x3 mm neodymium magnets.
I've included an F3D file and STEP file in case you want to adjust for different cups or overall capacity. (Lots of fillets so watch out on that)
Some Links for reference:
4 ounce Cups: https://www.amazon.com/gp/product/B07THLNPRJ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
(Cup OD: 74.5mm, Lid OD: 75.5mm)
2 ounce Cups: https://www.amazon.com/dp/B0721JK6R4?psc=1&ref=ppx_yo2ov_dt_b_product_details
Magnets: https://www.amazon.com/gp/product/B07B6NBK4C/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
The author hasn't provided the model origin yet.