Print the parts with at least 70% infill for greater strength. Example was printed using black petg at higher temperatures for better layer adhesion.
Video of it working here
Assembly requires:
Insert the M3 threaded inserts into the cam part and insert the 50mm M3 into the bottom of the stalk. Screw together. The parts should be loose enough to move freely.
Use the template to drill 4 holes in the mounting plate, and screw the stalks to the backing material from the back.
Depending on the length of the wood screws you're using and the thickness of the mounting plate, you may want to deepen the holes on the bottom of the stalk. As printed, these are 20mm deep.
The author hasn't provided the model origin yet.