Print freezes when using Slic3r from GIT source

Controllers Smoothie
1

I’ve run into an interesting issue when trying to print with G code generated by Slic3r I built from GIT source.

What happens is after the skirt loops are printed, Smoothie retracts, moves to begin printing the actual piece, and then freezes. I’ve tried printing several things and every time the outcome is the same.

Looking at the GCode it looks like the freeze may be occurring due to a negative feedrate value. I’m not a G code expert, but am I right to assume negative feedrates are invalid?

Has anyone else experienced this when using Slic3r built from source?

Here’s a snippet of the offending G Code.

G1 Z0.450 F7800.000
G1 X129.694 Y121.278 F7800.000
G1 Z0.250 F7800.000
G1 E4.00000 F6000.00000
G1 F-360.595
G1 X106.300 Y121.278 E5.15010
G1 X106.296 Y120.642 E5.18137
G1 X109.185 Y120.639 E5.32340
G1 X109.730 Y120.572 E5.35041

Imported from wikidot

2

That’s definitely a Slic3r bug, you probably want to report it to them.

Cheers :slight_smile:

3

Yep, I did some digging and found someone else has the same issue and reported it on GitHUB, Issue 3045. It seems to be caused by AutoSpeed. Once I disabled that, it slices and prints correctly. Hopefully they get it sorted because I like AutoSpeed.