Hi, my name is Evan and this spool holder I designed in Tinkercad. It's supposed to be super simple and easy to set up. I have never entered a competition like this before, so I  hope it's just what you were looking for! BTW Joel, I love your videos.

Details:

This spool holder has 2 pecies, the spool holder and the clip. It is super easy to attach to the shelves and will hold a little more than 1KG.

Instructions:

First get the half with the rod, and clip it onto the wood from the bottom up. Then put the other half over the first half going from the top down.

Print Settings:

Resiloution-0.15                                                                 Platform adheasion type-Raft or Brim                                   Infill-20%                                                                          Supports-No