About this 3D model

This simple filament holder system only requires 4 blocks printed out. They are then connected with 5mm threaded rod and some 11mm x 5mm x 4mm r/c bearings. Its both quick and easy to make. You can see the build here (including a video) http://3d-printer-kit.com/?p=803 There is a video of it in use here http://3d-printer-kit.com/?p=831