You'll need M3x10 screws or something similar. I used some screws for plastic that are 3.1x10.
Both pieces are printed in PETG and glued together. I used a 0.6mm nozzle and around 5-6 perimeters with a 50% infill.
The author remixed this model.
I saw this idea by Keith Johnson online and iterated on it, as the thing isn't available worldwide.