http://www.thingiverse.com/thing:89044
Получается можно пихать любой пруток и прошивка автоматически будет подстраивать flow в реальном времени
https://github.com/filipmu/Marlin/commi ... 0ad5ab26da
+/**********************************************************************\
+ * Support for a filament diameter sensor
+ * Also allows adjustment of diameter at print time (vs at slicing)
+ * Single extruder only at this point (extruder 0)
+ *
+ * Motherboards
+ * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
+ * 81 - Printrboard - Uses Analog input 2 on the Aux 2 connector
+ * 301 - Rambo - uses Analog input 3
+ * Note may require analog pins to be defined for different motherboards
+ **********************************************************************/
+#define FILAMENT_SENSOR
+#define FILAMENT_SENSOR_EXTRUDER_NUM 0 //The number of the extruder that has the filament sensor (0,1,2)
+#define MEASUREMENT_DELAY_CM 14 //measurement delay in cm. This is the distance from filament sensor to middle of barrel
+
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0 //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm). Used for sensor reading validation
+#define MEASURED_UPPER_LIMIT 3.30 //upper limit factor used for sensor reading validation in mm
+#define MEASURED_LOWER_LIMIT 1.90 //lower limit factor for sensor reading validation in mm
+#define MAX_MEASUREMENT_DELAY 20 //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM and lower number saves RAM)
+
+//defines used in the code
+#define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA //set measured to nominal initially
+#define STANDARD_DIA 1.12837915 //The diameter of filament that has a cross sectional area of 1 square mm. This dia should be used in the slicer software settings
+