Steel Fisher – retraction calibration

I was printing a big model that has heavy support. It had a lot of retraction and during the printing, the nozzle hit a piece, dislocated, then spewing filament in the air. Two hours and 46 minutes of work wasted.

20161019_0108

I’m seriously thinking about exclusively running Prusa i3 MK2 or other Carteisan 3D Printer for printing big models that do not have floating Z axis problem.

Anyway there was strings, blobs all over the model. I decided to do retraction calibration.

After printing 22 calibration objects, I managed to find the best setting of retraction.  The average printing time of the test object was nine minutes.

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

config.g

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

Calibration model: http://www.thingiverse.com/thing:909901

I followed Ultimaker’s retraction guide that suggests:
Temperature of PLA: 180 C
Printing speed: 20 mm/s
Travel speed: 200 mm/s

PLA filament temperature: 190 C
All speeds of print moves: 30 mm/s (set the speed factor of DWC at 70%, which makes 21 mm/s.)
Travel speed: 250 mm/s

20161019_0109

20161019_0113

The unexpected result was that 180C had more string than 190C one.20161019_0114

About janpenguin

Email: janpenguin [at] riseup [dot] net Every content on the blog is made by Free and Open Source Software in GNU/Linux.
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