Retraction test

(10/19/2016)
I did retraction calibration for B'struder.

Extruder drive: B’struder
Kysan Nema 17 5.18:1 geared stepper motor, 2.4 V, 1.0 A

config.g of RepRapFirmware-dc42 1.12a

M92 411.230
M201 X4000 Y4000 Z4000 E3000 ; Accelerations (mm/s^2)
M203 X15000 Y15000 Z15000 E15000 ; Maximum speeds (mm/min)
M906 X800 Y800 Z800 E800 ; Set motor currents (mA)
M92 411.230

Retraction setting in Slic3r 1.2.9:
Length: 3.4 mm
Z Lift: 0.4 mm
Speed: 15 mm/s (10 mm/s and 20 mm/s give similar result.)
Retraction after layer change: on
Wipe on retraction: on

Filament: eSun PLA 1.75 mm
Layer height: 0.2 mm
Printing speed: 20 mm/s
Travel speed: 250 mm/s

190 degrees Celsius gave better result than 180 degrees Celsius. Why?!
(3/16/2016)

White one was done by RepRapPro Fisher last year.
There was huge improvement in retraction quality.
Only modification I did I glued end of Bowden tube on the push fitting of the extruder half year ago.

190 C or 180C wouldn't make mu