How To Make Efficient Grinder : If you all follow the following steps you might get efficient spawner. Step 1:- Choose a location 13 by 13 blocks wide or AT LEAST 12 by 12 Wide Step 2 :- Now Make a 12 x 12 Base for Grinder At least 2 High from Surface Step 3 :- Make 8 High Walls Including the Top. Step 4 :- Find The middle Point. It will be a 2 x 2 Hole Make The Floor Packed ice So if You place a blaze spawner it will quickly Drop blazes into your grinding hole.[As Blazes Get Hurt When they touch water] Step 5 :- Place Water Sources at Each Corner and Make Pillars As Shown in the Picture. Step 6:- Make The floor where you grinding as Shown There You Have it A Efficient Grinder . DO NOT FORGET TO LET WATER FLOW. You can keep Hoppers beneath but In Creative server I can't place hoppers. Please Do Tell If U need Help Server : Factions In Game Name : hpzhd [NOT A SCAMMER ] :> Enjoy