This is a cute heart-shaped slinky that's easy to print. No support required.
The model is 10cm tall and I printed mine using Bambulab Silk PLA. Feel free to try more crazy colors!

After printing, gently separate all the coils of the toy: It shouldn't be difficult to separate the first coil. You can start the process using the tip of a small knife by prying into one of the gaps between the coils.

Please ignore the warning about the 'floating cantilever' that appears before slicing: the model leaves small gaps by design.