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).
Added two parts to keep a book open. It is simply clamped in the existing bookstand (and requires another M4x10 screw, a self-locking nut, and a washer).
I also added an (alternative) leg - for more stability with non-centered books.
The version in the photos is printed in PLA+, but it's also stable enough with PLA.
In total, 88 grams of filament are needed (@my configuration).