Traveler's notebook stand - 40 degree angle

Copied in TinkerCad from Kilinich, carefully deconstructed, adjusted and reconstructed to reduce the rising angle to 40 degrees.

I decided to keep both the front and back 40degrees, which in retrospect is not very smart; to should be 40 degrees for the front and 50 degrees for the back to keep the 90 degree angle in between, but I suspect it will not make very much of a difference.

I might re-remix, but only if I encounter issues.

This is a remix, all credits to https://www.thingiverse.com/Kilinich for creating the stand; https://www.thingiverse.com/thing:4966669