1. Repetier-Firmware > Configuration.h
#define EXT0_STEPS_PER_MM 1387 // setting for MakerGear Plastruder
2. Slicer Settings
If your setting in Configuration.h is correct for your Extruder, modify the Slicer-Settings (e.g. Slic3r)
Calibration Tutorial:
Calibration
or here a simplified example:
The attached image (Extrusion.jpg) shows 3 different layer height settings and the theoretical extrusion areas. The layer height is what you set in Slic3r and the extrusion width is calculated by Slic3r.
This is the theory, howerver there are a few parameters that affect the amount of plastic extruded (firmware configuration, speed, temperature, filament, inaccuracy etc.). To correct this deviation modify the extrusion multiplier:
Slice a simple cube (attached TestCube.stl) using these settings in Slic3r:
; layer_height = 0.25
; perimeters = 2
; top_solid_layers = 0
; bottom_solid_layers = 2
; fill_density = 0.0
; perimeter_speed = 40
; infill_speed = 60
; travel_speed = 180
; scale = 1
; nozzle_diameter = 0.35
; filament_diameter = 1.75
; extrusion_multiplier = 0.95
additionally with a Brim of 3mm
Temperature (PLA): 200 degrees C
Slic3r calculates the extrusion width = 0.39 => wall= 2 * 0.39 = 0.78mm
1. Print the cube.
2. Measure the wall thickness = 0.9mm (sample).
3. Calculate the new Extrusion multiplier = 0.78/0.9 * 0.95 = 0.85.
4. Set the new value for the Extrusion multiplier to 0.85 in Slic3r and slice the cube again.
5. Repeat step 1 to 4.
CubeTest3s.jpg shows what you should get a the end.
I hope this helps.
Edited 7 time(s). Last edit at 08/08/2013 04:58AM by flurin.