Designed for my son BMD as I purchased the doodle tops from amazon which were expensive, flimsy and not as interesting.
I have kept the shaprie a very tight fit so that it doesn't come loose that easy. Needs a bit of fight to get it in the first time on a 300 micron print. 100 micron print maybe a bit better fit if that is the route you wish to go.
The top spins great. Make sure you have a good surface to spin it on. Print a few and spin with different coloured sharpies from the dollar store. Good fun for you and the kids, if any..
Watch out for more designs as and when I get inspired. Please follow Rethink on www.facebook.com/increthink or www.instagram.com/rethink