Concentric circle test with thing:  http://www.thingiverse.com/thing:11895

3D Printing
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Concentric circle test with thing: http://www.thingiverse.com/thing:11895

60fff3b5eb97319cefa9a69e98ed56f5.jpeg
60fff3b5eb97319cefa9a69e98ed56f5.jpeg1530×2048 988 KB