The Curved Base is meant to have an elastic band run through it, to strap around your leg. Other than that, no parts needed. Use a raft to print the Grip and the Curved Base, low layer height or smoothness, supports also needed for the Curved Base.

Remixed from: https://www.thingiverse.com/thing:4724769

OnShape (It's jank as hell BTW): https://cad.onshape.com/documents/aac85686a9c5c7bd7704088d/w/8c52d16c6e0698621cb6ccb7/e/1dbeba748c80f3b0ae08aa5a?renderMode=0&uiState=667ce78493d9c1551c1e88b7