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Header/Startup code question...

Posted by mhackney 
Header/Startup code question...
May 26, 2017 02:25PM
I'm using the Slic3r Prusa Edition and I'm trying to figure out how to remove/change the behavior of the generated startup code. Basically, the Printer Settings->Custom G-code->Start G-code panel allows one to enter startup code. I've done that and put a comment to mark the end of my startup code. When I slice, my output code looks like this:

; my start Code here (removed for clarity)
; end of Start G-code
M109 S230 ; set temperature and wait for it to be reached
G21 ; set units to millimeters
G90 ; use absolute coordinates
M83 ; use relative distances for extrusion
G1 Z0.200 F7200.000
G1 E-1.00000 F1500.00000
G1 Z4.200 F7200.000
G1 X-7.787 Y-0.887 F7200.000
G1 Z0.200 F7200.000
G1 E1.00000 F1500.00000
G1 F900
G1 X-6.076 Y-15.912 E0.44902
G1 X-5.881 Y-16.866 E0.02890
G1 X-5.514 Y-17.799 E0.02977
G1 X-4.986 Y-18.659 E0.02995

My question is, where does the sequence:

G1 Z0.200 F7200.000
G1 E-1.00000 F1500.00000
G1 Z4.200 F7200.000

come from and is there a way to remove it? In particular, the "Z dab" effect with the G1 Z0.020 - I'd like to eliminate that as well as the 1mm retract (and later 1mm advance). The "Z dab" is occurring over a prime line that I print in MY header section and causing a string to get drawn and ultimately contaminate the first layer of the print. It's driving me crazy. I can, of course, manually edit this but I'd like to understand where it's coming from and if it's possible to remove.


[sublimelayers.blogspot.com]

A strategy for Successful (and Great) Prints [forum.seemecnc.com]
Strategies for Resolving Print Artifacts [forum.seemecnc.com]

[www.EclecticAngler.com]
Re: Header/Startup code question...
May 27, 2017 12:03AM
I don't know how to remove this, but I learned to print 2 skirt lines to overcome the issue. The first line to prime the nozzle and the second pushes the loose ends away. ( most of the time )
Re: Header/Startup code question...
May 27, 2017 05:55AM
Thank you. I am a little more critical and "most of the time" is not reliable enough for my production runs. I think I have it sorted out though but need to test. I think it is the normal retract/Z lift occurring after I extrude my prime line. I just need to extrude and do a short segment with not extrusion. Need to test it still.


[sublimelayers.blogspot.com]

A strategy for Successful (and Great) Prints [forum.seemecnc.com]
Strategies for Resolving Print Artifacts [forum.seemecnc.com]

[www.EclecticAngler.com]
Re: Header/Startup code question...
May 28, 2017 08:32AM
With the new slic3r_Prusa version you can disable z-lift below xxx mm. Very helpful for the first layer.
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