Add formula for LIN_ADVANCE_K
With this formula, a start value for K for further fine-calibration can be calculated.
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// Implementation of a linear pressure control
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// Implementation of a linear pressure control
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// Assumption: advance = k * (delta velocity)
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// Assumption: advance = k * (delta velocity)
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// K=0 means advance disabled. A good value for a gregs wade extruder will be around K=75
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// K=0 means advance disabled.
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// To get a rough start value for calibration, measure your "free filament length" between the hobbed bolt and the nozzle in cm.
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// Then use the formula that fits your system, where L is the "free filament length":
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// Filament diameter | 1,75mm | 3mm |
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// Stiff filament (PLA) | K=47*L/10 | K=139*L/10 |
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// Softer filament (ABS, nGen) | K=88*L/10 | K=260*L/10 |
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//#define LIN_ADVANCE
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//#define LIN_ADVANCE
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#if ENABLED(LIN_ADVANCE)
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#if ENABLED(LIN_ADVANCE)
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