how to make custom lego compatible bricks in autodesk 123D design you need leocad http://www.leocad.org/trac autodesk 3d print utility http://apps.123dapp.com/3dprint/install.html autodesk 123d design http://www.123dapp.com/design and netfabb http://www.netfabb.com/downloadcenter.php?basic=1
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