Permanent Allen hex key T driver handles

I tried printing this T-handle in an attempt to convert some of my 5 bazillion Allen wrenches into useful screwdrivers, but it didn't work out for me, as the keys kept falling out. So I borrowed the overall design and rebuilt them from scratch in two pieces that glue together for a more permanent solution, as well as added some minor embellishments of my own.

I'm including the FreeCAD source file in case anyone wants to modify it, as I only actually modeled the 2.5mm version and scaled the rest accordingly in my slicer. If you want to do the scaling yourself, use the included STEP master file; I think those scale without the resolution losses you get with STLs. Otherwise, sizes 1.5-4.0mm are available in STL.

Printed from PETG for durability - my tolerances weren't perfect, so I had to use quite a bit of force to insert the Allen keys, but I guess that at least prevents them from coming loose inside the handle.