Wait what's this about XP-Farms? XP Orbs causing some issues? Anyways I found two blaze spawners I was going to setup a XP farm for, I found a design that has a open/shut system that prevents them from spawning when you don't need them. It's pretty cool. sounds like you should share the design with the others. I heard po set up a MASSIVE farm (at least she says she did) I could imagine that would cause some problems for the server, left running 24/7 The design has nothing to do with other farms, other farms have there own ways of opening/shutting. For blazes its light level. Fixed by adding holes to the top of the xpfarm, adding sticky pistons near the holes with a block to cover it. Building around the hole, filling it with lava then wiring it down to a control switch. Which flips the sticky piston from releasing/shutting the lava flow. Disabling or enabling blaze spawns. Also has another sticky piston control bottom which controls the flow of how many blazes drop down. Also wired to another switch.