Hello everyone,
This will be usable "as is" by very few people because it is intended for a specific binocular and also a tripod, but I hope it will serve as an idea and a starting point.
That's why I've also packaged the Sketchup file so you can edit and apply it as soon as possible.
Also, the device is adjusted to my pupil distance and there is no possibility of further adjustment, but that's not hard to add...

Edit:There is the replacement for holder_3_3 in files holder_4_a and holder_4_b.
The original (3_3) is splitted in two parts so it can be printed laying down (without support) and screwed together. That makes it much stronger
Of course you will have to add two stops for adding hexagon and square nuts, but it is not complicated...