Model is tuned for PC Blend (Natural), for orientation and print settings see attached 3mf file.
I print with MK4 in enclosure at 42 - 46 deg. temp.
Spring is 4.5 - 5mm diam, around 10mm long.
My blinds insertion hole is ~17mm, but this can be easily adjusted (BlindHole param).
If print is not clean, and internal part do not slide without resistance, sand a bit internal part slide edges.
If you want to print with other materials it may require adjusting slides gap (SlidesGap param) and/or slides angle (SlidesAngle param).
Cheers
The author marked this model as their own original creation.