svenhb
commented
2 years ago I will add the 'E' axis.
I believe the "Factor" only takes 2 decimal points.
Do you think it must be that accurate (0.05224489795918367346938775510204)? I will extend to perhaps 6 decimals
About the "Command extention" "Add distance related command 1" the "Absolute value" checkbox does not seem to work? Makes little difference in gcode if any,
The distance will be given in absolute or relative values - important if you start the code and forgot to zero your E axis. Whtih absolute values it first turns back to zero....
The extrusion of the filament speed must match the XY speed
I think it is not possible to control via grbl or any other CNC controller: only axis given in one command line can run simultan. with the given one feedrate.
kneo1
Hi. I am experimenting with 3d printing an svg file. One line per vector and only 1 "slice" or level. Simple lines to be printed directly by the 3d printer head. I am using the "Command extension" with "Add distance related command 1" I use "B" letter save gcode and then search/replace B to E in notepad.
About the "Factor" option, what should it be for extruding through a 0.4mm nozzle? With the default "1" it extrudes way too much. I have tried 0.05 and it extrudes much more reasonably. 1 mm extruded at the nozzle of 0.4mm equals 0.05224489795918367346938775510204 mm on E axis at 1.75mm I believe the "Factor" only takes 2 decimal points.
For the filament retract I use "Pen up/down translation" with "Z" and "Individual" in "Z" heigh set/engrave to 2 and 0 in "Individual" "Pen Up/Down" G91;G1 E-4 F2000;G90 / G91;G1 E4 F2000;G90 for filament retraction on Z up movement. I switch to relative (G91) to retract since there is no way to know the absolute positioning on E axis.
With these options printing the SVG on 3d printer kind of works but extrude ratio is way off, too much filament. About the "Command extention" "Add distance related command 1" the "Absolute value" checkbox does not seem to work? Makes little difference in gcode if any, idk.
Extruder calculations: 1.75mm filament area is 2.4052818754046854481979613403234 sq mm 0.4mm nozzle area is 0.12566370614359172953850573533118 sq mm Ratio: 19.140625
So 1 (one) length of 1.75mm filament will be 19.140625 long 0.4mm filament 1 mm length of 0.4mm filament equals 1/19.140625 of the 1.75mm filament or 0.05224489795918367346938775510204 mm
The extrusion of the filament speed must match the XY speed of the extruder nozzle for the filament to remain relatively uniform 0.4mm If the XY movement is slower that the extrusion rate then more filament will be deposited and the filament will be squished between the nozzle and the table.