This model prints with essentially no supports, there are just a few trees at the bottom of the ramp but even they are optional. I have used 3d printed marbles when designing this and the files for them are included in a print profile. To assemble you just put the TT motor in the slot of the motor mount, push the Archimedes Screw down into the ramp and onto the motor shaft. I personally use the speed controller that Bambu sells to make the marbles return even faster but that part is optional. This model should work with 10mm to 15mm marbles although I have mainly designed it for 12-14mm marbles. If you decide to print the parts not using the included print profiles I highly recommend using a brim on the screw as it is prone to falling down. 

I would love to see someone print this in one of Bambu's gradient filaments! 
 

If you liked this model, consider checking out my Differential Gearbox Fidget 
[https://makerworld.com/en/models/1570028-differential-gearbox-fidget-v2#profileId-1651136](https://makerworld.com/en/models/1570028-differential-gearbox-fidget-v2#profileId-1651136)