As advertised it is very loud! My kids love it. Like the comments and instructions say there is a lot of force on the gears. I originally printed the large ones at 65% but broke one and redid them at 100%. I sprayed in some white lithium grease on the gears and contact surfaces to keep things from getting too hot.
Blue & White
Some parts took a bit of sanding to get a good fit. Used about 1/2 a roll of each color. A bit more white as I had to reprint several parts (my fault). Took a couple days to get all the parts printed.