Thursday, September 29, 2011
The Ultra-Light Hot-End Works!
A while back, I made up this hot-end to get an idea of how light I could machine one. Completely assembled and configured with a PTFE sleeve for 3mm filament, this little guy weighed in at 14.7 grams.
Not long after, I sent it out to be tested. Before sending it out, I had to convert it to 1.75mm by making up a PTFE liner with a 2mm ID.
Today, I received a confirmation that this nozzle does indeed print PLA with a 1.75mm filament! While a cooling fan was required in order to keep the nozzle holder cool, this proves that a 15 gram hot-end is certainly feasible.
Some concerns were expressed, however. Once concern was that the hot-end is too long. This is easily rectified as, without an aluminum heat-sink, I can shorten a hot-end. The other concern was that the nozzle tip would sometimes hang on the prints. At the present time, the nozzle tip has a 2mm OD. Reducing the OD, of the tip, may be a reasonable compromise to this problem while still ensuring that a nice, flat, layer is extruded.