Designed to fit Sam's Club Boltless Industrial Storage Rack, but could potentially fit other racks if they are similar enough.
Its meant to print in 1 piece standing up and should slide on.
It is designed to fit 4x Jumbo Elmer's glue sticks, but can also hold other things if you want.
Sam's Club Shelf Model # 016069-1
https://www.samsclub.com/p/members-mark-4-shelf-industrial-storage-rack/prod22160218?xid=plp_product_2
The author marked this model as their own original creation.