Slic3r vs Cura – honeycomb pattern

I use Slic3r v1.1.7 to generate a Gcode file for 3D printing.

round_grid2

I spent last Sunday to get rid of the hairy strings on printed object like this. I thought adjustment of retraction values in Slic3r would solve it – retraction calibration.
cDSC_0035

Well after printing a lot of round hoods, I realized that I was attempting the impossible solution. I had played with different retraction setting which all ended up producing hairy strings.

Retraction length: 5 mm
Lift Z: 1 mm
Speed: 20 m/s
Extra Length on restart: 0 mm
cDSC_0030

Retraction length: 2.8 mm
Lift Z: 1 mm
Speed: 10 m/s
Extra Length on restart: 0.01 mm
cDSC_0035

Retraction length: 2.8 mm
Lift Z: 1 mm
Speed: 50 m/s
Extra Length on restart: 0.02 mm
cDSC_0036

Retraction length: 3 mm
Lift Z: 1 mm
Speed: 100 m/s
Extra Length on restart: 0.05 mm
cDSC_0038

Cura saved the day!
Default retraction setting
cDSC_0040

cDSC_0029

cDSC_0042

After I noticed that Cura produces different pattern of first layer, I carefully watched how Slic3r builds layers of the grid object.

First sweep doesn’t have any honeycombs. cDSC_0020

In second sweep it firms the honeycombs by draws a lot of short vertical strokes between wavy channels. It looks fine but here the real problem of hairy strings. The nozzle does 50 short jumps. Each jump involves one retraction.
Jumps count:
3 (1st row)
5 (2nd row)
6 (3rd row)
7
8
7
6
5
3
cDSC_0022

cDSC_0026

cDSC_0020_eColor green represents the strokes.cDSC_0026_eCura draws a complete honeycomb one at a time which reduces the hairy string caused by short jumps.cDSC_0026_cura

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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