I wanted to cover up several holes below the radio on my dash and didnt find a suitable little shelf so i made my own in fusion 360. it works well and covers the holes and holds a pen or 2. Just dont make it out of junk pla like i did. In car heat in Australia is really hot and managed to soften as seen in dash picture. I will need to upgrage my printer to make it out of something more heat resistant.

FlashForge

Finder

No

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0.2 layer heights

Print with 3 or more perimeters