Here's how I do it. Bust it all up. Use a small tube I find you use less butane and get a nicer yield then using a long glass sprayer that holds lots of weed. And I use silk screens instead of coffee filters they dont rip and are anyway nicer. I spray butane into the tube till it's almost coming out, stop, shake the tube wait few seconds, spray few seconds, way few seconds ect. The tube in that pic, I use just under half a can of butane. After I sprayed desired amount out I put the glass dish into warm water if you dont have a vac pump. Then once its bubbling up like crazy I use a pin and a blowdrier to pop the bubbles and give it a little bit more heat. And slowly keep getting and popping over couple days until it's either wax butter or shatter. Enjoy