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How exactly does "Compatible material diameter" affect the extrusion values in the gcode?
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· How exactly does "Compatible material diameter" affect the extrusion values in the gcode?
Your example of G1 E20 would normally provide 20mm of material out of the extruder, not the nozzle. In the normal course of printing Cura knows the filament diameter and feeds the correct length of filament to provide an extrusion LayerHeight x LineWidth x ExtrusionLength. The relationship is "mm of filament" to "mm of extrusion" and is by volume. Knowing the diameter of the filament gives Cura the volume / mm of filament.
Your line G1 E20 calls for 20mm of filament to move through the extruder, and the printer knows the steps/mm of the E motor. The basic fact is that 1.75mm dia filament is 2.405mm². An extrusion .4 wide x .2 high is .08mm² so that ratio would be 1mm of filament = 30mm of extrusion. The Gcode would look something like
I'm sure you can get it to work other ways, but the above is what I understand of the relationship between the filament diameter and the Cura calculations.
Posted
· How exactly does "Compatible material diameter" affect the extrusion values in the gcode?
I haven't messed with this but your printer (called a "machine" in cura) has compatible filaments. Then there are filaments with diameters. You can tell cura that it is compatible with 1.83mm diameter filaments but you then have to select a filament that is "1.83mm in diameter". The default is probably 1.75mm in diameter and so it's probably off by 4.6%. Oh wait - it's squared. So it's off by 9.35%.
You probably also want to set your line width parameter to 1.83mm. Typically you want the line width to be the same as the nozzle diameter.
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GregValiant 1,342
Your example of G1 E20 would normally provide 20mm of material out of the extruder, not the nozzle. In the normal course of printing Cura knows the filament diameter and feeds the correct length of filament to provide an extrusion LayerHeight x LineWidth x ExtrusionLength. The relationship is "mm of filament" to "mm of extrusion" and is by volume. Knowing the diameter of the filament gives Cura the volume / mm of filament.
Your line G1 E20 calls for 20mm of filament to move through the extruder, and the printer knows the steps/mm of the E motor. The basic fact is that 1.75mm dia filament is 2.405mm². An extrusion .4 wide x .2 high is .08mm² so that ratio would be 1mm of filament = 30mm of extrusion. The Gcode would look something like
G0 X0 Y0 Z.2 F7200 ;starting out at X0 Y0 Z.2
G1 X30 Y0 Z.2 E1.0 F3000 ;30mm extrusion = 1mm of filament
I'm sure you can get it to work other ways, but the above is what I understand of the relationship between the filament diameter and the Cura calculations.
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gr5 2,224
I haven't messed with this but your printer (called a "machine" in cura) has compatible filaments. Then there are filaments with diameters. You can tell cura that it is compatible with 1.83mm diameter filaments but you then have to select a filament that is "1.83mm in diameter". The default is probably 1.75mm in diameter and so it's probably off by 4.6%. Oh wait - it's squared. So it's off by 9.35%.
You probably also want to set your line width parameter to 1.83mm. Typically you want the line width to be the same as the nozzle diameter.
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