These brackets are made for the double tact mod. They can hold 3 buttons each.
It is recommended that you print each one individually, as printing more than
one at a time seems to decrease their quality slightly as the printer jumps from
one to the other. I printed these as-is without supports and they came out fine,
although you should take a knife and clean them up a bit. The side button is 
meant to be a squishy tact.