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I got a 3D printed lens mount from here:
https://sprkplg.com/(started figuring out how to do it myself first before realizing mamiya press lenses are such an obvious choice someone must have done it already, and found this guy)
Obviously no meter and zone focus only but my main camera is a Leica I so fine by me...
That said dof is pretty shallow (the film is a bit bigger than 6x9, so big) and it has shit latitude/high contrast so you need to expose it fairly carefully.
I really like the look when you nail it tho and it's fun to shoot with other people and see how it turns out, give them the photos, etc.
^ new page fail; @shinkuu_kiss got any details on your instax, I am toying with 3D printing a graflok back for Instax for 4x5