I have fine adjust the dimension of the adapter a bit. The central hole is 2 mm bigger and the optical axis is moved 0.5 mm. There is a new STL file to download, version 1_5. This one I haven't 3D-printed yet. I used the old adapter and carved a bigger hole into it.
http://www.astrofriend.eu/3d-printin...r-adapter.html
Lars