Drilled out nozzle for the Ultimaker 2

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3DVerkstan's first tests show that printing at 16mm^3/s is possible with great results, the blue vase pictured being a single wall print with 0.5mm layer height, printed at 40mm/s (16mm^3/s) Forum Thread: http://umforum.ultimaker.com/index.php?/topic/6548-how-to-modify-machine-a-um2-nozzle-to-08mm/ The process is relatively simple if you have the right tools on hand. In my case, I had the necessary tools at Stockholm Makerspace (www.makerspace.se). Here's how I did it: 1. Clamp the 6mm front part of the nozzle assembly in a 6mm collet mounted in a collet chuck fitted to the lathe head stock and make sure it runs true. Also, ensure that the flat part of the assembly is perfectly flat against the collet front. 2. Mount an ER collet chuck with a 1/8" collet in the lathe tail stock, and set up a 0.8mm carbide milling cutter to drill the hole. Position the head stock so the tool is just outside the nozzle assembly in the retracted position. 3. Run your lathe at the highest possible speed (for me it was 2200rpm). These small carbide cutters love high RPMs and will break easily if run at lower speeds. Use the hand wheel at the tailstock to drill out the nozzle orifice to 0.8mm. 4. Put up a piece of aluminum larger than 10mm in the collet chuck, turn the face flat, and then drill a 5mm hole. Tap it with an M6*0.75mm tap to be able to screw in the back of the nozzle assembly. 5. Screw the nozzle assembly tight into the tapped hole. Put up the 2mm end mill in the tailstock, measure the front of the nozzle and zero out the tail stock dial. Fire up the lathe at maximum rpm and use the tail stock to mill down the front of the nozzle about 0.3mm. Step 4 and 5 are theoretical since I didn't have a M6*0.75 tap handy but had a milling machine and therefore used the milling head and a milling vice to do the job.