I made this from a Challenge coin holder I found on Printables:
https://www.printables.com/model/368379-large-pyramid-challenge-coin-holder
I reduced the size and made the slits smaller to accommodate poker chips, you might have to change the scaling depending on the thickness of your chips.
It holds 10 chips in a pyramid shape
Pyramid_Poker_Chip_Holder.stl | 41.4KB |