This LEGO Great Ball Contraption (GBC) module uses Nicolas’ (Nico71) ball pump to push the balls up through the tower. The balls then roll down a rotating double helix that is made from LEGO slides (6 x 12 x 8 studs, 11267). It works very reliably and does not jam. There are some more photos over at Flickr.
2 thoughts on “Double Helix Tower LEGO GBC Module”
nice module, any instructions
Not yet. The helix ever to slightly violates the LEGO system and hence I could only start modelling it in Stud.io. When I have some spare time I will get back to it.