From 599649e45d997099cc19a10e53a31bd044e977a1 Mon Sep 17 00:00:00 2001 From: Sebastianv650 Date: Sat, 15 Oct 2016 13:38:47 +0200 Subject: [PATCH] Add formula for LIN_ADVANCE_K With this formula, a start value for K for further fine-calibration can be calculated. --- Marlin/Configuration_adv.h | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h index 97bd9803f9..07d9711694 100644 --- a/Marlin/Configuration_adv.h +++ b/Marlin/Configuration_adv.h @@ -503,7 +503,12 @@ // Implementation of a linear pressure control // Assumption: advance = k * (delta velocity) -// K=0 means advance disabled. A good value for a gregs wade extruder will be around K=75 +// K=0 means advance disabled. +// To get a rough start value for calibration, measure your "free filament length" between the hobbed bolt and the nozzle in cm. +// Then use the formula that fits your system, where L is the "free filament length": +// Filament diameter | 1,75mm | 3mm | +// Stiff filament (PLA) | K=47*L/10 | K=139*L/10 | +// Softer filament (ABS, nGen) | K=88*L/10 | K=260*L/10 | //#define LIN_ADVANCE #if ENABLED(LIN_ADVANCE)