Siegecrafter Blackfuse

Normal, Flex and LFR:

The Assembly Line
First off, you will need to assign 2 groups of 2-3 DPS to jump into the pipes and onto the conveyor belt on the northwest side of the room, where the disassembled weapons will spawn. These two groups will need to switch off, due to [spell=144236], since the weapons come out every 30 seconds I believe, whereas the debuff lasts for 1min, but don't quote me on the exact number. Your DBM should be shouting at you every time the Assembly Line goes off. It may be a good idea to pick your top damage dealers, or priests since they can hover and not have to worry about running on the belt.

Belt teams:

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• Avoid [spell=144335].
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• Kill the weapon that causes the AoE your raid has the most difficulty avoiding, however the specific weapon destroyed does not matter quite as much as the next point...*
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• You MUST always kill at least one weapon before they reach the northeast wall. If you fail to do so, Blackfuse will gain [spell=148990]. You do NOT want this.
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• Jump forward or pop movement speed increasing abilities to keep from getting pulled into the far wall. Keybind your auto-run and strafe functions so that you can avoid beams more easily.
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• Remember, once a weapon has been destroyed, those remaining will become immune to damage.
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Getting off the belt.
Okay, now that you've killed one of the weapons, the rest of them are immune to damage so your job here is done for now. There are a few ways to get back on the boss:

1. 
   
2. Jump into the tubes near the opposite wall. They will port you back onto the boss platform.
3. 
   
4. Jump/glider/slowfall back onto the boss platform yourself.
5. 
   
6. Keep running on the belt and wait until all the weapons have passed through. Once that has occurred, the boss will automatically pull you back onto the platform.
7. 
   

The option you choose depends on yourself. Jumping off the belt as soon as a weapon goes down is preferable, since that gets you extra DPS on the boss and minimizes the number of beams you have to avoid. However, if you find yourself missing the tubes or falling into the space between the belt and the platform, you might want to simply keep running on the belt until Blackfuse pulls you off, that is if you have no trouble avoiding the beams.

For everyone else, whichever weapons are not destroyed will cause the following:

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• [spell=143856] - Run away from the laser, and stay out of the fire.
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• [spell=143639] - Again, ground AoE to stay away from. Orange rings will appear on the ground right before they come out. They will start at the missile's impact point and ripple outward, so the best way to avoid them is to run inward toward the original spawn point as the drills move outward.
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• [spell=144466] - Don't stand between the blades and the magnet when this goes off. DBM should yell at you.
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• [npc=74009] - These need to be stunned/slowed and DPSed down quickly before they reach their fixate targets. If they are allowed to do so, they will explode and one-shot the fixated player. Obviously, if you are being fixated, run away.
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Boss & Automated Shredders
This encounter has a few mechanics that tanks will need to pay special attention to in addition to everything else.

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• [spell=143385] - As described. The tank with this debuff will also cause 200% increased damage to the [npc=71591] with [spell=143387]. Thus, when a Shredder comes out, the tank with the most stacks of this debuff needs to pick up this add, and position it at least 35 yards away from the boss and in one or more of the AoEs caused by the weapons from the conveyor belt, as they will take damage from these. Might be easier to use a sawblade for this, since they can easily be positioned so that the add is in the blade, but not your tank.
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• [spell=116982] - The tooltip isn't quite accurate to this specific encounter. In Blackfuse's case, this is a 100% attack speed increase for 10 seconds every time your belt group destroys one or more of the disassembled weapons. This is unavoidable, so healers need to keep an eye out for it. Whichever tank is on the boss may want to pop CDs to help mitigate the damage.
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• [spell=144212] - The reason the Shredders need to be positioned at least 35 yards away from Blackfuse.
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Now for the rest of the raid:

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• [spell=143265] - Causes [spell=143327], don't stand in them. This appears to only target players standing at range.
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• [spell=142232] - When you see a Shredder launch itself upward, run away. The tooltip says 5 yards, but it's actually 15 yards.
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• [spell=145444] - Healers especially need to watch out for this, as it is unavoidable raid-wide damage. DPS may want to pop defensive CDs/health pots/lock cookies to help out. Also another reason why Shredders need to be picked up, tanked into AoEs, and burned down ASAP.
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TL;DR

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• All - Run away from Death From Above.
  Don't be in between the double orange lines on the ground.
  Don't stand in fire or lasers. Stun/slow Crawler mines while burning them down quickly; run away if you are fixated by one.
  Don't worry about DPSing Shredders, especially before Death From Above goes off.
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• Belt teams - Stay out of Matter Purification Beams.
  Always kill at least one weapon.
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• Tanks - The tank with the highest stacks of Electrostatic Charge needs to pick up the Shredder and position it in one or more of Blackfuse's AoEs, at least 35 yards away from the boss.
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• Ranged - Watch out for sawblades, don't stand in them, and don't stand between them and the Electromagnet when Magnetic Crush goes off.
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• Melee - Don't try to run over and DPS the Shredder. It's not really worth the DPS loss on Blackfuse and the trouble of dodging the various AoEs.
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• Healers - Watch out for Protective Frenzy when a weapon is destroyed.
  Watch out for Overload.
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*Suggested kill order: Mines, Laser Turret, Electromagnet, Shockwave Missile. This is because Crawler Mines require damage dealers to switch targets and lose DPS on the boss, while the drills from the missile are easy to avoid and won't even one-shot if people get hit like the Mines will. However, this order is flexible depending on your specific group.

Fun fact: most shredders in game have Kerrigan on their control panel, the old model has the one from Brood Wars and the Sky Golem has the picture from the Heart of the Swarm.
However Blackfuse's shredder has a Garrosh face on its computer panel, symbolizing that "Hellscream's eyes are upon you" is true :)

despite being a garrosh loyalist I'll have to admit that he drives a bad ass shredder almost a shame to dismantle it