Video at https://youtu.be/9FXX5WvYG1o.
Printed using green hatchbox PLA and red eSun PETG. The mix is because I needed to change filament for another project part way through the print. The larger parts used 0.2mm layers, with 0.1mm for smaller ones. Slicing with Cura 3.2.1, printed on my homebrew CoreXY. I made some minor changes, mostly making some of the washers thinner. There is one mistake in the plans: montage 13 says you need a 17.5mm piece of brass tube, and I think it should be about 9mm.
After a lot of work, I can get it to run reliably for 30-60 seconds. Occasionally it seizes, and so probably there are gear teeth that need improving. In the video I am driving it by hand as I don't have a suitable weight.