Lever adapter for round door knob

thingiverse

These knobs were designed for spherical doorknobs found in my workplace, allowing access with keys while turning the knob with a pen or other device without touching it, even using the elbow or forearm. I've printed several of these in PLA on a 120X120 bed. The lever is designed to be installed over double-sided foam tape placed around the circumference of the knob itself, using one piece inside each half of the lever. Orient the lever to clear door frame geometry and apply more tape or an additional layer if it slips after installation. Use #6 X 1/2" pan-head sheet metal screws to join the top and bottom, keeping points away from the lever. Do not overtighten; #8's may work instead. If possible, use a file or rotary tool and stone to remove the screw points for safety. This design is resistant but not gorilla-proof.