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 in place when it is done.
It is designed to hold a variety of common tools used with 3D printers such as cutters, allen wrenches, tweezers, and other items as well.
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.