flanges and bezel rail 70mm astronomy

Flanges and rail for astronomical telescope with an optical instrument diameter "70mm". (front lenses) BUT the outer diameter of the tube is a little less or around 76mm.

Simply to change the mounting when the original mount was not satisfactory (azimuth mount with a sliding bar for example). Commercial metal flanges are expensive for what they are, gutter flanges arranged as telescope flanges do not exist in all diameters, and otherwise there are researcher flanges, but it is no longer exactly the same. That's why I made these brides that go on a 70-500 skywatcher and a 70-700 meade

(the photo with all the grey parts shows an earlier version; it gives an idea of the rendering. I lengthened the rail; see second photo with black rail). Print the rail with the photo tripod threads upwards so that they are clean, and without brackets inside. As a result, there will be scratch-off holders on the other side of the rail, but it's less annoying. Print the flanges with supports, putting the concave arch part looking upwards. quality: as you wish. 20 percent filling for example. hull thickness: rather thick (1.2 was a bit thin for me, we guessed a bit like filling by slight deformation of a surface, I don't know if this is due to that)