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This is the second flange I've made for DIY night vision and astronomy projects.
It is just like the Nikon Flange, however the Nikon glass tends to be more in demand and more expensive.
Used Minolta AF glass can be had more cheaply.
While not as cheap as the C-mount, and the CS mount security camera lenses, the Minolta lenses are large, and have a rear objective that will fill the entire viewing window on the output, instead of just the center of it.
Like the Nikon flange, it features a passage to easy wiring of the ground ring.
The reason for 'Robust' in the title is that there is a second version which is cheaper (more material removed), but that I haven't printed yet.