I designed this on Tinkercad. It works great! The Top itself opens so you can store your string. The mini table is an add-on to display it. :)

Everything was printed without supports. I did use rafts when printing the actual spin top. The top itself closes in tight, so If you want to use it as a string holder, lightly sand the rim of the top part before pushing the pieces together. This Top works great indoors!