Arm opener for round knob door handle
grabcad
I created a door opener to enable opening doors with round knobs without having to physically touch them. In our company, we unlock this door using an RFID card, but then have to manually pull on the knob. Now, thanks to my invention, you can use your arm instead. I suggest installing a thin rubber gasket between the knob and mounting plate to minimize screw tightening requirements. Print out the design as shown in the photo for optimal results. The addition of fiber orientation significantly improves bending stability. You'll need 4 M6 screws and 4 nuts for assembly. I successfully printed it using PETG material.
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