1.8:
The blaze's AI has been altered. Blazes will now attempt to attack the player even if there are blocks between them. A blaze will also alert other blazes in a staggering 50 block radius around itself of the player's presence upon being hit, causing all blazes within the wide radius to swarm the player, if they have a clear path. They now have a decreased firing distance: previously, blazes would shoot at the player from about 32 blocks away once angered, but they now shoot from only 16 blocks. When the player moves out of their radius, they will slowly "walk" over to the player, flying over obstructions in the way, but no longer pathfinding around walls and corners. When within melee range, the blaze will now actively rush towards the player and attempt to hit them out of melee range, and shoot fireballs once the player is out. They will not attempt to swim in water or lava, instead sinking to the bottom.
As I read it, Blazes will only attack you through blocks if they have been alerted previously. I also built Mumbo's farm (albeit extended a bit) and have used it in 1.8.3. with no problems, as long as you can get to the farm's AFK point without encountering or alerting/attacking any blazes en route - blazes that spawn in the farm will behave as before. I also have glass walls and, if not alerted as mentioned before, they behave normally .
What Mr_N_Derman said: the whole trick is to keep the blazes from ever going agro. I also built mumbo's design but I modified it slightly so that the on/off switch is right next to my AFK spot, about halfway (vertically) between the spawner and the kill zone. I have an entire nether brick wall between my afk room and the farm, so the only time I ever see any of the actual farm is when i run down some stairs to the kill zone.
100 blazes waiting in the crusher can REALLY lag your server, though.
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From the Blaze page on the wiki:
1.8:
The blaze's AI has been altered. Blazes will now attempt to attack the player even if there are blocks between them. A blaze will also alert other blazes in a staggering 50 block radius around itself of the player's presence upon being hit, causing all blazes within the wide radius to swarm the player, if they have a clear path. They now have a decreased firing distance: previously, blazes would shoot at the player from about 32 blocks away once angered, but they now shoot from only 16 blocks. When the player moves out of their radius, they will slowly "walk" over to the player, flying over obstructions in the way, but no longer pathfinding around walls and corners. When within melee range, the blaze will now actively rush towards the player and attempt to hit them out of melee range, and shoot fireballs once the player is out. They will not attempt to swim in water or lava, instead sinking to the bottom.
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As I read it, Blazes will only attack you through blocks if they have been alerted previously. I also built Mumbo's farm (albeit extended a bit) and have used it in 1.8.3. with no problems, as long as you can get to the farm's AFK point without encountering or alerting/attacking any blazes en route - blazes that spawn in the farm will behave as before. I also have glass walls and, if not alerted as mentioned before, they behave normally .
Mintutor now works in 1.13!
MrKite & Mc_Etlam ... I salute you!
What Mr_N_Derman said: the whole trick is to keep the blazes from ever going agro. I also built mumbo's design but I modified it slightly so that the on/off switch is right next to my AFK spot, about halfway (vertically) between the spawner and the kill zone. I have an entire nether brick wall between my afk room and the farm, so the only time I ever see any of the actual farm is when i run down some stairs to the kill zone.
100 blazes waiting in the crusher can REALLY lag your server, though.