The Hadley telescope by Maff is a great design that allows makers for an easy and cheap introduction to astronomy.
There are lots of difficulties when using a telescope for the first time, for me one of them was trying to take a picture with my phone attached to the eyepiece through a mount. With the original focuser the eyepiece rotates when you adjust the focus, so it was necessary to adjust the quite often. Also, if the phone is not perfectly balanced in the eyepiece its weight can make it rotate.
This design tries to avoid this problem so it will be useful when using a phone/mount or an astro-camera.
The focuser is composed by several pieces:
Apart from the usual cleaning of the pieces, it is recommended to do a dry fit before gluing with CA glue the retention ring. Don't use too much glue! The nut should be able to rotate with respect to the base.
After gluing make sure that the nut is rotating freely, if there is too much force try to put a bit of oil.
Printing:
I printed my parts with these settings:
Nozzle: 0.4mm
Layer height: 0.2mm
Infill: 30%
Supports: none
But any settings you used for the rest of your Hadley telescope should work with these
I made a small video showing the gluing and assembly process:
Focuser installed in the telescope:
I have included the original design files, I used FreeCAD 0.20, feel free to modify the design to your needs!
The author remixed this model.