I'm making a custom case for the Raspberry Pi and need a CAD model that is accurate to work with.
I've seen a few of them on GrabCAD, but I'm uncertain if those are good enough. Are there no official CAD files of the Raspberry Pi?
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If you look on the Raspberry Pi Wiki Resources, under Documentation you will find 3D CAD files:
RPi Model B 3D CAD files
Theses are various 3D CAD Versions in both RAR and ZIP.
I would say those are the "official" 3D CAD files. You can cross reference some of the dimensions from the Raspberry Pi's FAQ:
What are the dimensions of the Raspberry Pi?
The Raspberry Pi measures 85.60mm x 56mm x 21mm, with a little overlap for the SD card and connectors which project over the edges. It weighs 45g.
There are CAD Models on Grabcad that are made around the official documentation: