This design is a holder for two sizes of Tervis cup lids (normal and large). Needed something that worked up high in a cupboard for shorter folks, so the top is flared to ease insertion of the lids (for many lids at once, I just take it down and fill it up). It's also possible to turn the lids sideways to remove them through the front slot, rather than going out the top.
No supports are required and a step version is included to facilitate customization.
The author marked this model as their own original creation.