Posts made by BigPrinter

Will give it a go as I respect your knowledge, though we had assumed this was not a major contributor to the problem because we are not using a bowden cable, and the e-3d head we are using has a relatively short distance between the drive wheel and the hot end. Will let you know what we discover.

So back to this problem i have sorted out the extrusion rate so that its not over-extruding on long lines. But when it comes to doing ziz-zag infill or where the machine slows for corners i get over-extrusion as seen in previews post. I believe this is where the extruder rate is not slowing to match the speed of the print head as it Accelerates/decelerates at the end of straight travel. This is particularly bad for short zig-zag infill as the head never gets to full speed but the excess is still noticeable at the start and end of longer travels. So does the firm where compensate for this? Can the extruder velocity be proportional to the head instanious velocity or does it assume a very high rate of acceleration which makes this unnecessary in most physical designs and is only a problem in our build because we are starting with a very heavy cnc router. Hoping to hear that the compensation is built in and we just haven't enabled it or tuned it.

Big improimprovement origanaly it was sewing out now there a little bit of overshoot?

thanks thats fixed that problem did the auto tuning

it has 150mm clearance.
the latest version of creo gives the ability to change to relative values for the extruder.

iv now run into different problems. found the extruder was getting much hotter than the target temperature. so i attempted to re-calibrate the thermistor with no luck. when turning on the heater to 180 it would shoot way past 180 and error out. Have ordered some better quality temp sensors and hopefully this will solve my celebration problem.

@phaedrux
i am using a cnc router as a large 3dprinter and i have 2 steppers in the x axis and so im using the other extruder driver to run the other x stepper. Still need to play around with the acceleration as the table jerks around alot on short passes.

M566 X0 Y0 Z12 E120:0 ; Set maximum instantaneous speed changes (mm/min)
M203 X30000 Y30000 Z960 E1200:30000 ; Set maximum speeds (mm/min)
M201 X100 Y100 Z100 E100:100 ; Set accelerations (mm/s^2)

Got it printing for the first time today so now i just need to make fine calibrations.

Added M82 (set to absolute) to the start code for cura and it has fixed it.

think it might be an issue with duet using relative extrusion where as cura is giving absolute

Im using the duet3d wifi with reprap marlin gcode flavor in cura and im getting over-extrusion on my corners/curves any help would be greatly appreciated.

Thats great works now. Thanks

HI i have also had the same problem where the endstop locations are grayed out in the web config tool. I am using the duet3d wifi board with the firmware 1.21. Initially i had to change the directions of the steppers so that they would home correctly, but that created another problem of having the steppers driving the wrong way. The M574 command only tells it whether the endstop is at the high end or low end of the axis not what direction to drive to look for the endstop.
I then found the code for the homing ie the homex.g, homey.g, ect... and changed the direction that it drove to find the endpoint.

Original
G1 S1 Y1205 F1800 ; move quickly to Y axis endstop and stop there (first pass)
G1 Y-5 F6000 ; go back a few mm
G1 S1 Y1205 F360 ; move slowly to Y axis endstop once more (second

Modified
G1 S1 Y-1205 F1800 ; move quickly to Y axis endstop and stop there (first pass)
G1 Y5 F6000 ; go back a few mm
G1 S1 Y-1205 F360 ; move slowly to Y axis endstop once more (second pass)

after all that is there a reason the grayed out area is disabled?????