Is there firmware out there that takes into account the dynamics of the extruder when extrusion speed is coordinated with head movement speed?
A while back i searched around, all i found was an attempted at a implementation of something like this in marlin that didn’t quite work in practise.
I know that a very good aproximate model for the extruders is.
G(s)=e^-(d*s)*K/(1+Ts)
Research article: "liquefier dynamics in fused deposition modeling" gives this model, the article is based on a bigger thesis with loots of information on what happens to the plastic in the extruder.
e^(-d*s) = timedelay, Usualy so small it can be ignored
K = gain constant
T = timeconstant
u(s) = comanded flow rate
y(s) = ActualFlowrate
ActualFlowrate=G(s)*U
I am under the impresion that extruison of plastic is done in a speed as constant as possible(with as little aceleration as possible in the path direction) to avoid problems with over fill, is this corect?
Is this is the best place to post this topic?
Edited 1 time(s). Last edit at 02/02/2014 01:26PM by Calendar.