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Found four ntx 3d models.

$75
humster3d
3D model of Moto Guzzi Stelvio 1200 NTX 2015
$30
turbo-squid
3d lighting 4x18 model
free
cg-trader
Lego Mindstorms compatible brick for robot frame Free 3D print model
free
grabcad
NXT lego - L shaped beam