Book Stand (suitable for large and heavy books)

A bookstand, which is suitable for heavy books (cookbooks, for example).
The tilt angle can be adjusted in 30° increments.
Both sides should fit together tightly. I used a hammer to connect them with (careful) strokes.

Also needed: two screws M4x10, one screw M4x16 and three nuts M4 (in DIN 933).

The shelf has twice the size of my heating bed (its usable area is 200x170mm).

**UPDATE 22.06.2018**:
Added two parts to keep a book open. It is simply clamped in the existing bookstand (and