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Found six tuning pitched 3d models.

$12
cg-trader
Tuning Fork 3D model
$19
turbo-squid
Tuning Fork
$45
turbo-squid
Tuning Fork
free
grabcad
Quad Copter v3 (3D PRINTABLE FOLDING MICRO FPV H QUADCOPTER)
free
thingiverse
Rubber band powered race boat
free
3dwarehouse
Vox Humana Organ Pipe