Raise3D Pro2 Door Knob Extender
thingiverse
If your fingernails keep scratching the door plastic, this standoff will prevent any damage from occurring. It also makes it easier to grab the knob and open the door. I used M4-0.7 x 20mm screws and 4mm ID x 15mm OD flat washers to mount them securely. You can stack these standoffs if you prefer, but you'll need longer screws for that setup.
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