Version 1. Escura Hasselback focusing screen spacer & viewfinder holder

First, I recommend you to view the video by Yodayoungling (John-Michael Mendizza). The video explains the Hasselback Instax back made by Escura and the challenges you may have with it, but also what can be done about it:

The three files you will find here are a spacer for the matte screen, and two files that should be glued together so they fit an viewfinder.

John-Michael's recommendation was a height of 3.8mm to 4.3mm. I tried out 3.8mm and it works in my hands. Please, note the orientation of the spacer. The wells should be oriented down.

Then put your screen above the spacer.

I used Loctite Super Glue Precision for the holder. Make sure it is dry before you put it on the camera.

Then slide on the viewfinder. It will have a loose fit in the gap of the camera body. I do not want any unnecessary debris due to a tight fit.

Some test shots were satisfying when it comes to focus, Planar f3.5.

As seen in the view finder:

The uneven development will be the next challenge to solve.

You may also be interested in the Hasselback work by Tritschi: https://www.printables.com/model/694371-escuras-hasselback-adapter-for-hasselblad