People on the community call have asked for some mechanical engineering resources. Think of this thread as a penny bowl. Need a penny? Take a penny. Have a penny? Leave a penny. (Replace “penny” with mechanical engineering ideas, solutions and links.)
507 Mechanical Movements, a 1908 publication by Henry T. Brown, which has been animated by the interwebs just for you! … and you and you and you!
Lego technic Tora no maki by Isogawa Yoshihito, who has authored several visual lego guide books to making gadgets and contraptions. I’ve easily spent days with his books, and I subscribe to his YouTube channel.