Stand for watches rings central stand w/o support

I have expanded the watch and ring stand to hold up to four watches and 4–6 rings or small pieces of jewelry. 

I also relocated the support leg to the center, making it easier to take watches on and off. Most importantly, thanks to the double-arc shape of the support leg, this model can still be printed without any supports (if your filament is humid, please dry it or enable supports before printing).

The printing time has been optimized to the maximum extent, while minimizing material usage as much as possible.

Based on the original design by @j1nys