Inserting G1 before start macro, causing error on printer

[jmceara]

Bug description
Superslicer is putting some GCode before "Start G-Code", causing error while printing (Axis is not homed). More exactly this code:

G1 Z0.25 F27000
M107

Expected behavior
Don't inset anything else (movements gcode, at least) before "Start G-Code"

ValentinesHeart.zip

To Reproduce
Open project, slice and export gcode.

Screenshots

Desktop (please complete the following information):

• OS: Windows 11
• Version 2.5.59.8
• Voron v2.4 R2 with Klipper

[legend069]

disabled wipe_tower and the extra z movement command is gone.
re sliced with 2.5.59.7 bug is still present.

i can't replicate it with my config using a single extruder.(only the m107 command is inserted before the start_gcode)

likely same issue as here #4133

[jalanjarosz]

I can replicate this behavior in v2.5.59.8 Windows when Wipe Tower is active.

; generated by SuperSlicer 2.5.59.8 on 2024-02-25 at 20:20:29 UTC

; 

; external perimeters extrusion width = 0.56mm
; perimeters extrusion width = 0.56mm
; infill extrusion width = 0.56mm
; solid infill extrusion width = 0.56mm
; top infill extrusion width = 0.56mm
; first layer extrusion width = 0.56mm

; external perimeters extrusion width = 0.56mm
; perimeters extrusion width = 0.56mm
; infill extrusion width = 0.56mm
; solid infill extrusion width = 0.56mm
; top infill extrusion width = 0.56mm
; first layer extrusion width = 0.56mm

; object:{"name":"3DBenchy_-_Dualprint_-_Gunwale_Deck_Plate_Wheel_Frames_Roof_Chimney_top_-_3DBenchy","id":"3DBenchy_-_Dualprint_-_Gunwale_Deck_Plate_Wheel_Frames_Roof_Chimney_top_-_3DBenchy.com id:0 copy 0","object_center":[138.736543,81.175375,0.000000],"boundingbox_center":[138.736543,81.175375,24.000001],"boundingbox_size":[60.000004,31.000000,48.000002]}
EXCLUDE_OBJECT_DEFINE NAME=3DBenchy___Dualprint___Gunwale_Deck_Plate_Wheel_Frames_Roof_Chimney_top___3DBenchy_com_id_0_copy_0 CENTER=138.736543,81.175375 POLYGON=[[108.74,72.00],[108.74,71.93],[108.74,71.88],[108.75,71.81],[108.77,71.70],[108.78,71.65],[108.79,71.56],[108.81,71.50],[108.82,71.47],[108.83,71.44],[108.86,71.33],[108.88,71.30],[108.90,71.24],[108.95,71.12],[108.97,71.08],[108.99,71.06],[109.03,70.98],[109.11,70.86],[109.13,70.83],[109.18,70.76],[109.24,70.68],[109.30,70.62],[109.33,70.59],[109.34,70.58],[109.42,70.50],[109.46,70.46],[109.51,70.42],[109.58,70.37],[109.61,70.34],[109.66,70.31],[109.71,70.27],[109.83,70.20],[109.88,70.17],[109.94,70.15],[109.97,70.13],[109.99,70.12],[110.05,70.10],[110.16,70.05],[110.22,70.03],[110.29,70.02],[110.42,69.98],[110.45,69.98],[110.62,69.95],[138.37,66.09],[138.53,66.07],[138.79,66.03],[139.28,65.97],[139.35,65.96],[139.62,65.93],[140.16,65.87],[140.33,65.86],[140.82,65.81],[141.47,65.76],[141.56,65.76],[142.17,65.72],[142.33,65.72],[142.79,65.70],[142.91,65.69],[142.97,65.69],[143.29,65.68],[143.54,65.68],[143.80,65.68],[144.31,65.68],[144.75,65.68],[145.19,65.69],[145.54,65.70],[145.65,65.70],[145.98,65.71],[146.41,65.74],[146.88,65.76],[147.17,65.78],[147.36,65.80],[147.47,65.81],[147.71,65.83],[147.78,65.83],[147.80,65.84],[148.53,65.95],[148.60,65.96],[149.11,66.09],[149.48,66.18],[149.78,66.27],[150.16,66.37],[150.42,66.45],[150.63,66.51],[150.85,66.58],[151.07,66.65],[151.28,66.71],[151.49,66.78],[151.50,66.79],[151.71,66.86],[151.96,66.95],[152.19,67.03],[152.34,67.09],[152.56,67.16],[152.77,67.24],[152.98,67.33],[153.40,67.49],[153.66,67.60],[153.87,67.69],[154.08,67.78],[154.40,67.92],[154.61,68.02],[154.89,68.15],[155.10,68.25],[155.50,68.44],[155.70,68.54],[156.10,68.75],[156.50,68.96],[156.89,69.18],[157.28,69.40],[157.67,69.63],[158.05,69.86],[158.24,69.98],[158.43,70.10],[158.62,70.22],[158.80,70.34],[159.19,70.59],[159.37,70.72],[159.74,70.98],[159.92,71.11],[160.29,71.38],[160.48,71.51],[160.84,71.79],[161.02,71.93],[161.20,72.07],[161.37,72.21],[161.74,72.50],[162.09,72.80],[162.61,73.25],[162.78,73.41],[163.06,73.67],[163.23,73.82],[163.40,73.98],[163.73,74.30],[164.06,74.62],[164.22,74.79],[164.55,75.12],[164.86,75.46],[165.05,75.66],[165.33,75.96],[165.48,76.14],[165.79,76.49],[166.24,77.02],[166.67,77.56],[166.82,77.74],[167.10,78.11],[167.25,78.30],[167.66,78.86],[167.93,79.24],[168.19,79.63],[168.35,79.87],[168.42,79.98],[168.47,80.09],[168.50,80.14],[168.53,80.20],[168.55,80.26],[168.61,80.41],[168.67,80.59],[168.68,80.65],[168.72,80.89],[168.73,81.01],[168.74,81.08],[168.74,81.26],[168.73,81.32],[168.72,81.45],[168.70,81.57],[168.69,81.63],[168.67,81.75],[168.65,81.81],[168.60,81.98],[168.53,82.15],[168.48,82.26],[168.36,82.47],[168.21,82.71],[167.94,83.09],[167.67,83.48],[167.26,84.03],[167.02,84.34],[166.97,84.41],[166.68,84.78],[166.54,84.96],[166.39,85.15],[166.10,85.51],[165.64,86.04],[165.22,86.51],[165.06,86.69],[164.75,87.03],[164.26,87.53],[163.59,88.19],[163.27,88.49],[163.10,88.65],[162.76,88.96],[162.42,89.27],[161.90,89.71],[161.72,89.86],[161.55,90.00],[161.18,90.30],[160.83,90.57],[160.64,90.72],[160.45,90.86],[160.27,90.99],[160.09,91.12],[159.91,91.26],[159.54,91.52],[159.16,91.78],[158.58,92.16],[158.19,92.41],[157.80,92.65],[157.60,92.77],[157.40,92.89],[157.01,93.11],[156.61,93.34],[156.32,93.49],[155.73,93.80],[155.53,93.90],[155.12,94.10],[154.71,94.29],[154.51,94.38],[154.06,94.58],[153.91,94.65],[153.69,94.74],[153.40,94.86],[153.07,94.99],[152.74,95.12],[152.24,95.31],[152.03,95.39],[151.61,95.53],[151.17,95.68],[150.96,95.74],[150.71,95.82],[150.49,95.89],[150.31,95.94],[150.03,96.02],[149.80,96.08],[149.66,96.12],[149.00,96.29],[148.58,96.40],[148.09,96.49],[147.98,96.50],[147.85,96.52],[147.55,96.54],[147.22,96.57],[146.82,96.60],[146.39,96.62],[145.86,96.65],[145.30,96.66],[145.13,96.67],[144.69,96.68],[143.62,96.68],[143.33,96.67],[142.89,96.66],[142.49,96.65],[142.20,96.63],[141.32,96.58],[140.65,96.53],[140.09,96.48],[139.35,96.40],[138.94,96.35],[138.46,96.28],[110.57,92.40],[110.48,92.39],[110.41,92.37],[110.32,92.35],[110.26,92.33],[110.22,92.32],[110.10,92.28],[110.05,92.26],[109.94,92.21],[109.84,92.16],[109.73,92.10],[109.67,92.06],[109.51,91.94],[109.45,91.89],[109.38,91.82],[109.31,91.76],[109.25,91.69],[109.18,91.60],[109.11,91.51],[109.08,91.45],[109.03,91.37],[109.02,91.35],[108.99,91.30],[108.95,91.23],[108.91,91.13],[108.86,91.02],[108.81,90.86],[108.79,90.80],[108.77,90.69],[108.76,90.63],[108.75,90.55],[108.74,90.50],[108.74,90.39],[108.74,72.00]]
; plater:{"center":[138.736543,81.175375,0.000000],"boundingbox_center":[138.736543,81.175375,24.000001],"boundingbox_size":[60.000004,31.000000,48.000002]}

M73 P0 R383
M117 Time Left 6h23m52s
G1 Z0.2 F720   <---  Bad G-Code inserted when using Wipe Tower.
M107
;TYPE:Custom
; Start G-code

Current fix is to use G-Code substitution to remove extra G1 Z move, but that also removes a needed one.

Inserted at the end of Start G-Code the following using a slightly different feed rate:

; Drop down to first_layer_height due to removing extra Wipe Tower Z-Move
; by using G-code substituation which remove two G1 Z0.2 F720 moves
; one inserted by the Wipe Tower, and one that is needed.
G1 Z[first_layer_height] F600

[supermerill]

I changed the buffering for the start gcode. I missed the part with the sequential printing with wipe tower