Bar Knecklace Jig I used the ones from here https://www.amazon.com/dp/B0DF2PKDCV 

(Not an affilate link, just a link to what i used)

Circle to the top and the center nub is the same height as the bar for focus

You can fing my .3mf file on Makerworld at: https://makerworld.com/en/models/1070751



Settings I used on the Xtool F1

IR Power 90%

Speed 800

Pass 2

Lines per CM 300