Microscope parfocal extenders - RMS

[patta]

Hi all

I am designing a series of adapters and accessories for microscope, them made with 3D printing.

Today is the turn of RMS parfocal extenders, the rings that make the microscope objective a bit longer.
They came out pretty ok, good parallelism, the screws fit easy and tight.

I'm not selling them, you can download the files and print them yourself or order them to some 3D printing service. Making the items themselves is very cheap (one to few $) but then shipping and handling get expensive.

I will be very grateful for feedbacks, if they work properly for you, and which dimensions are most useful.
I have published for now extenders with 6.5 - 7.0 - 7.5 - 8.0 - 8.5 mm on Thingiverse:
https://www.thingiverse.com/thing:4567179