This is a one piece easy to print filter holder specifically designed to fit on the Minolta Spotmeter F. It takes a 49mm filter. The testing has been limited to only a 49mm B+W F-Pro filter.
This holder is really only useful if you have a 49mm filter already and you don't want to buy a new filter. I originally thought that the Minolta Spotmeter F had just baffling in the area in front of the lens, but I was mistaken. Those are threads so it takes a filter, 35.5mm to be exact.
The design has two springs incorporated into the design to hold the filter securely but not so securely that it is impossible to remove the filer. It also has a finger notch at the bottom so you can use your finger or thumb to nudge the filter out without touching the filter surface.
No more holding the filter in front of the light meter while taking a reading.
I printed this with Anycubic's ABS-Like resin. Its not too brittle and is good for the spring action.
Have a great day.
:)
Tom