Focuser for telescopes 2in - 50.8mm

Print settings

Nozzle size ......................... 0.4 mm 
Layer height ....................... 0.2
Number of perimeters ... 2
Infill ...................................... 25% /100%
Supports ............................. enforcers only
Bed surface ......................................... glue stick
Hotend temp ...................................... 240c
bed temp .............................................. 80c
Materials used: .................................. PETG / PLA

Additionnal parts

8x bearings 6mm inner diameter x 17mm outer diameter
4x M6 x 45mm screws (for the bearings)
1x M6 x 30mm screw (to lock focus and adjust friction)
3x M5 x 25mm screws (to attach the focuser)
1x open brass compression ring (optionnal)
2x M4 x 12mm thumb screws (for draw tube)
1x spring of 8-10mm long when compressed (friction plate)
1x M4 x 15mm screw

Notes

*in my opinion a metal focuser is more rigid and better overall. This print is good as an affordable option and if you want to build your own scope. Its not optimised for weigh or size but for relative stiffness and grip on the draw tube. 

The draw tube was printed with 100% infill to get maximum rigidity but 25% is good to test fit with a partial print.
Taps used to finished the holes and get a good fit (M6 and M4).
You can use washer to get a tighter fit vertically.
Made with PETG and PLA to test. Its good to test the distance of this tube spacer to get proper focal plane distance right.

Here's the main inspiration: (post #38)

https://www.cloudynights.com/topic/627562-introducing-the-dual-speed-helical-crayford-focuser/page-2

and another for the size and compactness:

https://www.cloudynights.com/topic/694959-does-anyone-have-experience-with-the-kineoptics-focuser/

Remix as you wish. * Added .f3d file

Happy printing :)

Feel free to donate to my filament fund ;) with paypal.