I designed a simplified model of the finger press engine and 3D printed it today. I was pleased with the results. I had to change filament rolls during the process and was disappointed that the color of the new roll was more mustard yellow that true yellow, which it was supposed to be. I like the true yellow the best as it makes the print just pop with life (IMHO).
The added metal screws are to give the flywheel some weight.
Render is with LightWorks (Luminance - sampling)
Hope you like it