Slinky with diameter of 90mm and height of 100mm and 50 rings. It is very nice, problem is just to separate the rings. Printed with PLA. Try a height of 10mm (Model for height 10mm is also in the attachments ) and try to separate the rings and then you are ready to print a height of 100mm. 

Between rings is just 0,25mm of air. Hard to separate but nice to look. 

Separation: First use Needle-noise pliers and with movement make place between two rings where you insert Olfa-knife and go with the knife over whole length. 

Probably slinky should walk down the stairs, but the stairs were not found yet:) I would say the maximal length of the Stair should be cca 150mm.