I'm looking to increase the printing speed, through increasing the volumetric flow rate, which is currently at 5 mm³/s. Larger amounts cause the feeding mechanism to skip steps.

I'm running at 190 °C, which helps with easier bridging less stringing and personally see no reason to increase the temperature to the popular 205 °C.

So, my thought process is the following: since I run at lesser temperature, there is still potential for the heating block to provide more heat and I need a longer nozzle to accumulate more heat and provide more surface area for transfer to the fillament (PLA), to speed up the melting of the plastic inside the nozzle (which seems to be the bottleneck).

That's similar to using larger tips for soldring iron, when faced with heating up large surfaces in order to desolder something large, since we need to stay at precise temperature, and need to increase the heat supply as well.

The suggested solution is to switch to the E3D's Volcano "everything included" kit. Which is nice and cool, but I don't think it's that necessary.

  • Is it possible to just switch to a volcano nozzle? (Manufacturer#: VOLCANO-NOZZLE-175-0400)
  • Would it actually noticeably help to increase the extrusion speed?

Current setup:

  • Ender 3 Pro, no mods
  • Classic 0.4 mm nozzle
  • 1
    $\begingroup$ At 190°C PLA is barely melting, expect very weak bonds between layers. If you print a figurine it's ok, but anything requiring some strength will fail miserably. Also, increasing temperature reduces viscosity and allows you to print faster. At 220°C you could easily increase to 8 mm^3/s or more. $\endgroup$ – FarO May 4 '20 at 8:18
  • $\begingroup$ Relevant: youtu.be/0xRtypDjNvI?t=438 $\endgroup$ – FarO May 4 '20 at 14:46
  • $\begingroup$ I did find that 220 and more do produce more stringing and starting with 230 and higher bridging is sagging already at bridges length of 2cm. So it would seem 220 to be the higher end of less stringing and okay bridging. I'm gonna redo the flow rate test on 220 and report how much did it change the result $\endgroup$ – DayDreamer May 16 '20 at 8:58

Yes, the Volcano or the Super Volcano allow for larger flow rate (typically when using larger nozzles), that is where they were designed for. Just the nozzle will not help you, you need this larger nozzle shaft to be inside a Volcano heater block, else you cannot transfer the heat.

According to measurements from Metaform, the volumetric flow of a Volcano hotend is larger than the regular E3D V6 hotend.

enter image description here

  • $\begingroup$ If the limiting factor is not melt rate but viscosity, as was suggested here, then larger nozzle should help even without a more powerful hotend, no? $\endgroup$ – R.. GitHub STOP HELPING ICE May 4 '20 at 1:53
  • $\begingroup$ The question is about having a longer melt zone with the same nozzle diameter. I think the volcano won't help in this case, because you definitely don't need a long melt zone to reach a very puny 190°C :) $\endgroup$ – FarO May 4 '20 at 8:19

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