This Elliptical Gear with No Center Pivot is based on classic designs by
PerryT, Drayde, and Natetrue. Designer Cohlwiler liked playing with the the original off-center pivots and "thought it would look cool to remove the center ring entirely." Post a Make if you agree.
Barspin's OpenR/C Forumula 1 Car is a third generation design focused on simplicity. Order a motor and a battery and start printing! You're probably going to crash it, so why not print two?
Option8 brings the past into the present by merging Apple's original Mac with its Watch. Print one and give it to the Apple nerd in your life. They'll be eternally grateful.