You can print this with any filament, printer, layer height, nozzle, or scale you like. This print is not fussy at all.
I designed an older version of this many years ago, but the Printables Ring Holder contest made me want to revisit my old design and give it a little update.
This new version even has rounded corners so they won't lift and it needs no support. I have also added some small fillets at the base of the fingers for a smooth transition. In addition, there are now two versions, large and small, so there will be a holder for most any size finger.
The author remixed this model.