the contest is a fake!
the rules have not been respected ....
not all components are printable because:
-they are too large (example n10 Scanning Dock 25x35 cm or n.3 Wheel/Camera Riglength about 30cm)
-is too complex and not printable
I challenge you to try to print it ....
moreover
the twenty finalists are not those who have more favorites ....