This is a valentine I modeled for the kids, and I thought it was worth sharing. The whole thing is 2.5"x2.5"x0.225", and the clearances for rotation are 0.015". The spin action will still work if scaled down to 80%, but it won't rotate as freely. Scaling up to 120% also works.

I printed the files using the ‘fine- 0.12mm’ for the X1C on a 0.4mm nozzle with adjustments to improve the bridge and overhangs.

For supports: I used manual support added under the bridged length of the post. Support must be from the build plate only or support material will keep the heart from spinning.

I used Octogram surface patterns for the starburst effect.