Summary

Flash diffuser for Metz 26 AF-1 with modelling light
It also includes a mounting ring for the Panasonic Leica 45mm macro to mount some cardboard and aluminium tape
You also need

• AAA battery clips like https://nl.aliexpress.com/item/1005005593181237.html
  the ones I used for the design are 10x10mm
• a small toggle switch
• a 3W LED strip as found in cheap flash lights I used this one https://www.action.com/nl-nl/p/2581152/werckmann-inspectie-zaklamp/
• Nylon M3 bolts to secure the thingi on the flash
  I used a on-off-on toggle switch to power the LED strip with 3V or 4.5V. In practice 2 AAA batteries and 3V is enough light for modelling and autofocus
• hot M3 inserts for the battery tray and the diffuser

The lens mounting ring requires M3 hot inserts

I used clear PETG for the diffuser. Depending on the slicer use minimal wall thickness a around 30-40 infill. The more detailed and random infill the more diffusion
The case is any color you like as long as you put aluminium tape on the inside for refection