@theruttmeister said in Square Nozzle Orifice:
How does the internal geometry differ on the two nozzles? With the carbide nozzles I've used before there was no throat, the internal faces tapered all the way to the actual opening. We never did real testing to compare to our standard steel nozzles, but there was a noticeable improvement in quality.
Internal geometry is identical to an E3d V6, but with a square orifice. Within 60 days we should be sampling nozzles without that major ID. Then we will be able to try different internal geometries. In your case, were you using the nominal ID, with a draft (cone shaped end to end)? Just want to make sure I'm understanding correctly.
Can you clarify what you mean by 'easily'?
I'd love to get these nozzles on a load cell, as I assume what you are describing is lower extrusion force. Certainly surface area of the nozzle has a huge impact on extrusion force.
The 0.4mm round nozzle is 0.126mm2, the square is 0.16mm2. The relationship between extrusion force and cross-sectional area of the nozzle isn't simple, but in this kind of range I'd expect it to be reasonably linear. So I would expect the square nozzle to require 25-30% less force for a given volumetric flow rate.
By easily I mean I changed no settings going from .20 to .40 other than the layer height.
I don't currently have the ability to do that kind of testing. Though I'd certainly be happy to toss one of these to someone who could.
It would be interesting if a square or otherwise non-round nozzle would let you extrude significantly narrower paths than the major diameter of the nozzle, but without a loss in quality. That might be the trick for getting down to silly size extrusions. Although it would probably need something other than sinker EDM to make it even close to economical.
What extrusion widths were you using?
I was thinking perhaps a trapezoidal shape could help things, almost like a paintbrush effect. Though I'm not sure where to begin on geometry, and because it would only have one "direction" it's not really feasible for me to do anything but make one. Perhaps it's time to start considering another axis, maybe something open source already exists here.
I was printing .50mm width.
I do find it very interesting that what I would have assumed was ringing from the X/Y stage, clearly must be some sort of ringing in the extruder.
Could be laminar low, could be a masters thesis for the eggheads over at UC Berkeley.
lol, I hadn't considered it would be ringing from the extruder. Based on my jerk/accel settings I'm still inclined to believe it's from the XY. It's throwing a Hemera around without much regard for anything at the moment.