Originally shared by Andrew Hodel
Turned a solid bronze extruder today from a 3in rod I had. Gonna try 1mm nozzle diameter. 2 hours to make it.
Nice work. You may end up with problems since the whole thing has the same thermal transfer properties. Most use stainless steel to keep heat at the nozzle end.
http://www.engineeringtoolbox.com/thermal-conductivity-metals-d_858.html
It’s weird how tin (25%) and copper (75%) has a lower thermal conductivity that is so much lower than plain copper, it’s actually on par with stainless.
Not too weird. Brass and stainless are both alloys. The stressed molecular structure would inhibit heat transfer.
Awesome!
Alas, been there, done that. Couldn’t heat it higher than 140C.
@Mike_Miller really? I’m holding it in my hand at 220C in the other photo on my profile page.
You need a skinny area between the hotend and the fan cooled fins otherwise the fan will just cool it all down. That’s why the lower fins were tapered although it worked better when I just took them off completely.
Mine was brass, IIRC into an aluminum heater block. (I’d melted the PEEK, and I was killing time while my e3d shipped. )