Dimensions houses: 18cm high, 17 wide.

Dimensions collecting tray: 20-17cm.

Dimensions tube: 32-32mm,

I have a version with 1 and 2 tubes, so you can do it in both directions.

The number bonds machine is in 2 parts so it is easy to store.

Important:

Only the top of the door need support, i suggest tree support.

update 16-11-2024:

You can use pompons but these don't have enough weight to roll smooth.

I added a profile with 25mm balls, 

If you want to print these, I highly recommend cleaning the print bed with alcohol and / or using adhesion spray (3dlac).

The contact surface is small, with a dirty print bed the balls will come loose.