Parking disc clip
thingiverse
This is a clip for for holding your paper parking card/wheel/ticket whatever you need to be visible against car front window. Just apply some double sided tape on the flat thicker part of the clip and stick it on your window. I printed mine with 100% infill (since it's so small you haven't basically any other option :) ) and 0.2mm layer height with 3-4mm brim using transparent PET-G filament.
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