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Found seven prototyping 240 3d models.

$15
cg-trader
Earrings-240 3D model
$15
cg-trader
Ring-240 3D model
free
blendswap
"Sisyphus Engine No. 1" physics based marble machine animation
free
grabcad
TopOpt CubeSat
free
grabcad
Zlin Z-50
free
thingiverse
Mostly Printed CNC / MultiTool
free
thingiverse
Mostly Printed CNC / MultiTool