The one gripe I have with the Fenix TK35 flashlight is that it cant easily be stood upright on its base. A decent flashlight shining at a white ceiling is remarkably good at lighting up the entire room, try it!

This easy to print model snugly snaps onto the base of the TK35 in a way that still exposes the buttons. I've only printed in PLA but I imagine more flexible materials could also work well.