Optimized for ease of printing and assembly. The main body prints in one piece with supports to clear for the slot for the gates. Gates come in two pieces; the bottom piece can be bolted (m4 bolts) or glued on after you slot it in the gate.
Gate slots are sized so a ¼" chisel makes very quick work of cleaning out the supports.
Print with snug supports (see pics for what you end up with). PETG or ABS recommended, probably 4+ wall layers for strength. Printed mine with PETG.