This Heater Block is an advanced version of previously published heater block to be used on Makergear hot ends or DIY designs. Advancements are: Drawings and instructions are provided, or you can get completed, manufactured parts here: http://www.ebay.com/itm/221228407572 http://www.ebay.com/itm/321108299432I supplied detailed PDF drawings of this design, along with STL and STEP solid model. There is enough information to manufacture and assemble these heater blocks. Guidelines for aluminum blocks are basically the same as for previous version: I.) For CNC machining: This thing to be machined from 3/8" x 3/4" 6061-T6 extruded bar, then tapped M3 & M6 according to drawing. Machining strategy is up to you. Use STL / STEP files and drawing to create G-code. II.) You can make it manually from 3/8" x 3/4" 6061-T6 extruded bar stock: Making of M3 stud thermistor is straigth forward. See drawing for details. You will need: Sequence of operations: Hex thermistor safely rated up to 500F / 260C for prolonged period of time because it uses JB Weld steel epoxy to fix thermistor in hex stud housing.