The beauty of 3D printing is that yesterday this was an idea, now I can test how it feels, and yes, there will be few small changes, but this should be nice, should provide 2+ hours operational time.

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This is great for prototyping, but 3D printing makes possible also to have many different version, so something that fits perfectly your needs.
This kind of loupe is quite ideal for 3D printing, the DIY pack (lenses, magnets, screws etc.) can be send as a letter, and the printing material does not cost much.
There is many public places where it is free to 3D print (in Finland at lest)
I understand though perfectly that 3D printing / DIY is not for every one, it is great there will be alternatives.
For us this is a test project, we will be selling the DIY pack. If that provides enough income we will keep developing the loupe, version for different cages etc. also for Video Assist etc. and provide the printable files for anyone to print.