Reprap Extuder steps per mm calculation
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calculated assuming non-compressablew fluid. Basically what volume goes in must come out. Assuming the pressure and temperature inside the extruder are held constant.
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DescriptionValueUnitNameFormula
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filament diameter (3mm)3.00mmFD
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extruded diameter (0.5mm)0.48mmED
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pinch wheel diameter, outer diameter of teeth on my custom brass splined gear is 7mm8.00mmPWD
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drive gear ratio (1 normally, 5 for 55:11 drive)5.00-GEAR_RATIO
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number of steps per revolution (I'm using a half steps drive )400.00-STEPS_PER_REV
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pi3.14-PIPI
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length of filament drawn into extruder in one revolution 25.13mmFL (PI * PWD)
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radius of filament entering the extruder1.50mmR1(FD/2)
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radius of extruded filament as it exits the extruder0.24mmR2(ED/2)
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length extruded in one revolution of pinch wheel981.75mmEL((FL*R1*R1)/(R2*R2))
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number of steps needed to extrude a length of 1mm of plastic.2.03718327157626-E_STEPS_PER_MM(E_STEPS_PER_REV * GEAR_RATIO / EL)
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