3D Printed "Wobbler" Style Air Engine

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'3D Printed Wobbler Style Air Engine' is yet another one of my 3D printed air engine designs that you can find hundreds, if not thousands of, 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 back in the 1940s. 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 it must be less than nine total parts. My design consists of six 3D printed parts and one spring which results in seven 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 by right clicking on "Rev 1" joint in the "Joints" Component then selecting "Animate Model". The wobbler engines I've printed and assembled will run at around one PSI, and as shown in the second video they really move at fifteen PSI. 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.