https://www.youtube.com/watch?v=KSpeL_5g9Jc https://www.youtube.com/watch?v=hYXx1mSMStk '3D Printed "Wobbler" Style Air Engine' is yet another of my 3D printed air engine designs. You can find hundreds, if not thousands of wobbler style engines in various forms all over the internet. I machined my first wobbler many years ago on my cnc mill and lathe, and as I've read, but not confirmed, the original wobbler appeared in a magazine article in the 1940's. I created this 3D printed version of a wobbler style air engine in response to a young engineering student who challenged me to build a 3D printed air engine with as few parts as possible and, according to her, must be less than 9 total parts. My design consists of 6 3D printed parts and one spring which results in 7 total parts, so I think I accomplished the challenge. If you wish to modify the design for an even further reduction in parts count, I've included the Autodesk Fusion 360 file "Wobbler.f3d" which contains the designs for all of the 3D printed components used in '3D Printed "Wobbler" Style Air Engine' along with the ability to animate the assembly as shown in the video (right click on "Rev 1" joint in the "Joints" Component, then select "Animate Model"). The wobbler engines I've printed and assembled will run at around 1PSI, and as shown in the second video will really move at 15PSI. And as usual, I probably forgot a file or two or who knows what else, so if you have any questions, please do not hesitate to ask as I do make mistakes in plenty. Designed using Autodesk Fusion 360, sliced using Cura 3.0.4 and printed in PLA on an Ultimaker 2+ Extended and an Ultimaker 3 Extended.