切片软件增加了多余的回抽代码

[dgpower 0]

最近我在使用最新cura 12.1软件，它在打印机结束代码前面会自动增加一段长距离的回抽。

 

1、这是我的打印机结束代码设置

M104 S0

M140 S0

G92 E0

G1 E-10 F2000

G28 X0 Y0

M84

 

2、然后我用cura切片，在结束代码的前面，它自动增加了四行代码

G1 F1500 E112.5943

M140 S0

M204 S500

M107

第1行代码导致料被大幅度回抽。
第4行代码M107已经不被marlin推荐使用

 

3、我尝试换别的模型，也存在同样的情况。

G1 F1500 E3768.34114
M140 S0
M204 S500

 

4、但奇怪的是，前两周我打印还是完全正常的。这让我十分困惑。。。

 

Edited January 1, 2022 by dgpower

[GregValiant 956]

The last E value before that line is E119.0943 and so that move to E112.5943 is your normal "Retract Distance" and doing a little math it is 6.5mm.  That is the normal situation when retraction is enabled in Absolute mode.  In your second example the E3768.34114 is probably "Retract Distance" less than the previous E value in that Gcode file.  Assuming that your retract distance was 6.5 for that file, that would make the previous E value 3774.84114.

 

This is the Ending Gcode used by a lot of Creality printers.  It will work on your Anet.

When Cura finishes calculating the Gcode it will add that final retraction...call it 6.5mm.  The code below will retract an additional 4mm and so at the end of a print the filament will be 10.5mm back from the nozzle.  That would need to be taken care of either by adding purge lines to the StartUp G-Code, or making sure a skirt/brim is long enough to "take up the slack".

 

;Ending Gcode

G91 ;Relative positioning

G1 E-2 F2700 ;Retract a bit

G1 E-2 Z0.2 F2400 ;Retract and raise Z

G1 X5 Y5 F3000 ;Wipe out

G1 Z10 ;Raise Z more

G90 ;Absolute positioning

G1 X0 Y{machine_depth} ;Present print

M106 S0 ;Turn-off fan

M104 S0 ;Turn-off hotend

M140 S0 ;Turn-off bed

M220 S100 ;reset feedrate

M221 S100 ;reset flowrate

M84 X Y E ;Disable all steppers but Z

;End of the End Gcode

[dgpower 0]

感谢您的回复。我想我已经找到原因了

 

我用的3D Printer是Anet ET4X，我把存储卡重新格式化后，之前的打印结束后自动把料回抽超过200mm的问题就消失了

 

估计这是机器固件的一个bug

 

这台机器还有另外一个bug，如果非正常断电，再次打印时显示屏上会显示快速的完成打印，但打印机实际上没有任何的动作。也是通过格式化存储卡就可以解决问题。

[Smithy 1,134]

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