I'm designing a crucible / extruder, and right now it has a .6mm hole to extrude from. Will this work? A chart with various metals listed would be nice.

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  • $\begingroup$ Keep this one. Do you want the steel to be liquid coming out or solid? $\endgroup$
    – Rick
    Oct 2, 2015 at 17:34
  • $\begingroup$ The Length/Diameter of 66 would be very difficult to machine. Typically anything over 30 is impossible/ requires special circumstances. Do you need it to be that long for cooling? $\endgroup$
    – Rick
    Oct 2, 2015 at 17:39
  • $\begingroup$ I can adjust the L/D. I just guessed when designing this in FreeCAD. $\endgroup$ Oct 2, 2015 at 17:48
  • $\begingroup$ Liquid, that rapidly gets cooled to solid. $\endgroup$ Oct 2, 2015 at 17:49
  • 2
    $\begingroup$ What are you trying to accomplish with this device? What is the end product supposed to be? Small particles, beads, a wire or strand? Something else entirely? Also you will need precise temperature control to avoid freezing in the extruder. The extruder should be made from something like graphite or it may weld/erode/contaminate the steel. Keep in mind steel is usually cast at 2900 F $\endgroup$
    – wwarriner
    Oct 2, 2015 at 17:52

1 Answer 1


Making a nozzle with that long and thin of a hole is not feasible, but you could make a larger hole behind it and just have the last 3mm be 0.6mm in diameter. This would be feasible in a ceramic, but due to cost, I might make the nozzle into an insert that goes into a larger piece made of cheaper material.

Things to be concerned with:

Each of those could be their own question, answerable by people with different expertise. So I'd recommend asking them separately.


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