NozzleMachining Steps 1. Face one end of bar 2. Create a center divot 3. Drill orifice being VERY careful. Go in ~ 2mm, using small steps 4. Use compound cross feed to taper tip; I like 45 degrees, smooth is best. Make sure there is no divot left and the orifice is still clear5. Part off the tip leaving some extra length 6. Face new end and create a new center divot 7. Measure the length of the nozzle and set tailstock at zero with sharp tip flush with end of nozzle 9. Drill in to about 1.5mm less than the length of the nozzle 10. Use a flat end mill to create an internal edge leaving the center taper 11. File flats at the nozzle end and make sure the nozzle is still clearBarrelThis new design has a few more steps but being shorter it is easier to drill through the 4mm hole which is hard on the drill bits.Machining Steps1. Do a rough cut from stock material 2. Face one end and create a divot with a center (alignment critical) 3. Drill all the way through with the 4mm drill bit. Take your time and use lots of cutting fluid. If the drill bit wobbles at the start it is off-center... try again. 4. Mark the side that started drilling from and flip the part around and face the other end 5. Drill in 5-10mm with the 4.2mm drill bit 6. Tap M5-0.8 being careful with the tap 7. Mount the marked end 5mm into chuck making sure its straight by threading M5 threaded rod into the exposed end and clamping in the tailstock.  Once material clamped remove the 5mm threaded rod and tailstock.8.  Turn down the threaded rod until it is 5/16" only leaving threads in the chuck9. Finally cut the thermal break gap (not sure if necessary but doesn't hurt) with a cut-off tool... don't go too far, do it as close as you can to the chuckLiner 1. Cut the liner tubing a little extra long 2. Put the Nozzle and Barrel together with the liner inside 3. Screw in the push-fit connector into the barrel 4. This should push the nozzle and barrel apart so cut the liner by a little less than the amount of liner that is showing between the nozzle and barrel5. When put it back together the tightened push-fit connector should create a small gap between the nozzle and barrel 6. Chamfer the ID of the liner that is opposite the nozzle to help filament feedAssembly1.  Screw the barrel into the heater block until the thermal break is flush2. Lightly screw the nozzle in then heat it up to 250C before doing the final tightening3. Once cool screw the nozzle nut on4. Put the liner in and tighten the push fit connector onto it (connector may need to be removed when mounting the hot end)