About this 3D model

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).