It was easy once I realized how to mount it, using the posts inner recess. Nice to see it working, marbles does not gain too much speed.
I´ve started with the free one, but sure will buy some bigger ones. Base printed in Smartfil Wood filament, chain and gears are Smartfil ABS, module printed in Fillamentum PLA Premium. Alignment pegs break easily, finally used small screws with the same head diameter.
Fun object to print.
Instructions could be clearer but nice item at the end.