I designed this to support some document frames which are 9mm wide as well as a lithophane which is 4mm wide. I've included STLs for 2mm through 12mm in .5mm increments with tilt angles set 1 degree less steep for each 4mm of increased frame size.
If you need different sizes or angles or you just want to tweak the design, you can find my original, fully parametric OnShape document for the model at the following link:
Cheers!
&
Always Be Printing
The author marked this model as their own original creation.