Found 65 demonstrator 3d models

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...of the pla spring motor demonstrator (http://www.thingiverse.com/thing:402412) and the pla spring...
thingiverse
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...is a functional light-up eyeball demonstrator to encourage kids of all...
thingiverse
free
...is a functional light-up eyeball demonstrator to encourage kids of all...
thingiverse
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...designed mostly as a technology demonstrator or child's toy. the print...