Quoted from bitternerd:

These are obviously based on the design on thingiverse so I hope you are the original designer or tip him/her well if you decide to sell.
I made some of these and the time, materials cost, printer wear etc were not even close to worth it for profit, only for fun.
The original design was too small for pint cups and they would split the weak ass 3d layering so, if you haven't, I would suggest increasing the diameter.
The brackets were weak as hell too and did not hold up on route until I designed extra material where the angle occurs in the bracket.
Also would suggest a hole in the bottom if they may be at bars or they will fill with stale beer.
I decided it was easier/ cheaper/ stronger to get pingulps and add a design (sticker or a thin 3d printed plaque treated in acetone bath).
And then I just kind of lost interest as they broke or got stolen.
Your designs are cool though- but I would just share with friends instead of a lot of work for not much money.
Good luck!