Reinforced Knurled 1/4-20 Thumbscrew Adapter

This adapter should turn your ¼-20 socket-head cap screws into thumbscrews. This is especially useful for quickly screwing and unscrewing things from an optical table. I've optimized the model for fast printing without supports using the sequential bridging technique described by Maker's Muse. Unlike other ¼-20 thumbscrew adapters I've seen on Printables, this one is reinforced using a nut, a technique inspired by the metric thumbscrews by Elothan. I've made the model parametric and publicly available on Onshape and included a STEP file here.