A couple of the parts require two - check the picture.
Modeled to tight tolerances for better action, if your printer is a bit “fuzzy” file or sand the openings - It should not take much. (Prints perfectly on my MK3s.)
No supports needed. (Two drops of “superglue” required for knob and cross-piece. Alignment pins and holes in parts)
The author hasn't provided the model origin yet.