Did you know...#Extruder
...THAT AN EXTRUDER THAT CAN EXERT MORE FORCE ON A FILAMENT, WILL ALLOW FASTER PRINTING, WHEN THE TEMPERATURE STAYS THE SAME?
The first is the hotend and is the easiest to switch to an improved version.
The Extruder (filament feed) is the second.
An extruder that can exert more force on a filament, will allow faster printing, when temperature stays the same.
Extrusion force, usually measured in Newton, is depending on following factors:
Nozzle (orifice) diameter (ranging from 0.10-1.0mm in this graph)
the length of the melt zone, (ranging from 10-30mm in this graph)
As well as the layer-height.
Above the max extrusion force the filament shears along the teeth of the drive gear and therefore fails. The result is likely to ruin your print and may also clog your hotend.
Of course, one can raise the temperature of the Hotend in order to melt the material more quickly, however this may only bring you so far, as the material starts to deteriorate and even burn at too high temperatures. This will lead to discoloration, clogging and generally to lower quality prints.
For ABS and a standard MK8 Aluminium Extruder the force calculated is roughly 53.2N while the measured force is a little higher for lower print speeds and lower for higher print speeds (pointing towards the nozzle as another limiting factor.).
The take away from this is: the higher the force your extruder can push, the quicker you can print. But there is an end to this correlation and usually this end is reached when the extruder grinds the filament. Mind you, this value is different with each and every material.
Conclusion: A better extruder will allow for faster and more reliable printing.
So what factors are responsible for a good extruder?
We will discover that in a later blog post.
References: 1,2,3: Additive Manufacturing 16 (2017) 1-11, Rate limits of additive manufacturing by fused filament fabrication and guidelines for high-throughput system design. Available: https://www.sciencedirect.com/science/journal/22148604