Accessible High Torque Knob / Handle / Lever for water isolation valves

I made this high-torque handle for water isolator valves to make them easier to turn for situations where the valves are hard to reach or get tools onto or for people with reduced mobility. I've made 2 versions, one to fit valves with an 8 x 6mm shaft and one for 7 x 5mm shafts. This is designed to fit exactly onto the shaft, so if your printer tends to print slightly oversize the "hole compensation" setting in your slicer will help, or just force it on with the screw... that works too.... Note that this handle doesn't have any rotation-limit stops so you'll have to align it with the pipe or across the pipe yourself.

Should be printed in a fibre-reinforced filament, ABS-GF is a good choice but ASA-CF, PPA-CF, or PPS-CF would all work well. I'd suggest printing with 4 walls, use alternate extra wall, print the main body at 35% infill and set a modifier for the area around the shaft to use 100% concentric infill there. Support shouldn't be needed as I've provided a 0.2mm thick bridge over the hole for printability that you'll have to break out after printing.