String "Climbing" Christmas Tree is another string climber based on the dual spool design of this mechanism: https://www.youmagine.com/designs/string-climbing-mechanism. It doesn't really climb the string, it just appears to do so. Consisting of 9 unique parts (11 total), and only requiring the purchase of embroidery floss, once assembled String Climbing Christmas Tree puts to use the "String Climbing Mechanism" and further illustrates how string climbing toys such as these, some over 100 years old, operate. "Bling" added by my wife. Video of prototype: https://www.youtube.com/watch?v=n-LyBzluu74. Designed using Sketchup Make 2016, sliced with Cura, and printed in PLA on an Ultimaker 2 Extended.