Using a 4 port Scorpion (center fire Cricket) with three 5 LPM concentrates on natural gas. With that combination made boro marbles up to 1.1 inches in diameter. Using NG at 5 PSI with the static pressure on the concentrates at 9 PSI.
IMO the Scorpion would be maxed out for your needs and would suggest something a bit larger to better fit your creative style.
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