About this 3D model

This is a rev1 of my extension ring set for the Canon EF mount. This part is designed to be printable without any support material. A well adjusted printer is necessary fo a tight fit. Extension tubes are mainly used to reduce the focus distance of a lens for macro photo. Better fit, locking, texture and electrical contacts are planned for later versions. The sample photos are taken with a Canon 550D (T2i), a 70-200 F/4 USM and a total of 100mm extension (2x this part) Please leave feedback, photos and the like in the comments! :) Update: Amplivibe did what i newer got around to do and remixed this to different lengths at http://www.thingiverse.com/thing:334254