Follow focus gears for Zeiss-Yashica Contax R (Y/C lenses)

A two part 360 degree 104T, MOD.8 follow focus gear set for Contax lenses. Either 10 or 12mm wide.
The 2 part assembly makes for easy mounting and removing or adjusting the position of the gear ring. The outside diameter is the same for all lenses, as a split-ring of variable thickness sits between the gear and the rubber lens grip. A compression fit means it doesn't slip, and FDM print layer-lines actually help with ridigity and hold it together.
The split ring thickness was chosen to suit FDM 3D prints, but several sizes are included if tighter or looser fits are required or if you make SLS versions.
most work with gear v3 + 5.4mm ring (eg 80/2.8, 50/1.4, 35/2.8, 25, 28/2, 28/2.8, 21/2.8, 18/4 ).(lens dia=ø63mm).
Yashica 21/f3.5 & ML Macro 55/2.8 use the 6.65mm ring.
Zeiss Sonnar 100/f3.5 - use the 6.15mm ring (lens dia=ø62mm).
Zeiss 80/f1.4 - use 1.75mm, but gear ring v2 with low profile txt.
Zeiss 135/f2.8 - split-ring 3.1mm.
(The inside diameter of the gear rings are 75mm, so you can deduct the thickness of a split-ring to calculate the diameter of other lenses they will fit. Despite the quoted ring thickness & tolerances there is usually around 1mm or more leeway, even including allowance for print variations...) .
v4 includes a short pan arm for precise movements. (or see the add on pan-bar here: https://cults3d.com/en/3d-model/gadget/follow-focus-pan-bar-attachment )

split rings included: 1.75, 2.7, 3.1, 5.4, 6.15, 6.55 & 6.65mm
eg ø75-(2x5.4)=ø64.2mm [for the Contax R 50f1.4 lens].

I made these in response to buying and using various unsatisfactory follow focus rings! particularly those with screws and clamps or rubber clips, soft teeth with backlash, where fixings get in the way or just cumbersome time consuming fixings.... these are the best!

FDM, PLA: 0.2layers with 20% infill is sufficient. No support required.