Start of print is clashing with bed clips

[stainl36 0]

Using Cura with an Octoprint connection to a Voxelab Aquila C2. Machine setting is based on an Ender 3 (I have changed the measurements to 220/220 but did also try with the initial 235/235) and I have the Voxelab Aquila profile.

 

When I attempt a print, the extruder returns home to the left front x/y axis and then the bed moves forward so that the extruder clashes with a clip I have on the left side of the bed. This may have even caused damage to the nozzle, which I will shortly replace.

 

However, I am carrying out less accuracy specific prints but not using Cura/Octoprint until I can work out what I need to change to ensure this initial movement does not occur down the left side of the bed. I guess it will be the GCODe start settings but not sure what to change. I expect it is the Move to start position line or Draw the first line as that seems to be moving the Y axis by 20 and attempting to draw a line of 200 (mm I guess?). Should I have a line moving the X axis before that? 

 

; Ender 3 Custom Start G-code

G92 E0 ; Reset Extruder

G28 ; Home all axes

G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed

G1 X0.1 Y20 Z0.3 F5000.0 ; Move to start position

G1 X0.1 Y200.0 Z0.3 F1500.0 E15 ; Draw the first line

G1 X0.4 Y200.0 Z0.3 F5000.0 ; Move to side a little

G1 X0.4 Y20 Z0.3 F1500.0 E30 ; Draw the second line

G92 E0 ; Reset Extruder

G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed

G1 X5 Y20 Z0.3 F5000.0 ; Move over to prevent blob squish

 

I will also be adding a BLTouch shortly. Does anything need to be added in the start G-code to reflect that?

Edited March 17, 2022 by stainl36
correcting measurements

[waintdeir 0]

Hi, you could move the start code purge line further away from the edge/clips by increasing the X-values - currently it draws a line at 0.1mm and a second at 0.4mm (distance to 0=home of X).

The second option (what i use) is to get rid of this purge line in the start code and use a Skirt (Bluld Plate Adhesion in Cura - I set two lines with a distance of 10mm). This way the purge line is not wasted material if i switch to a brim.

 

Option 1:

; Ender 3 Custom Start G-code with purge line 20mm from the edge

G92 E0 ; Reset Extruder

G28 ; Home all axes

G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed

G1 X20.0 Y20 Z0.3 F5000.0 ; Move to NEW start position

G1 X20.0 Y200.0 Z0.3 F1500.0 E15 ; Draw the first NEW line

G1 X20.3 Y200.0 Z0.3 F5000.0 ; Move to side a little

G1 X20.3 Y20 Z0.3 F1500.0 E30 ; Draw the second line

G92 E0 ; Reset Extruder

G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed

G1 X25 Y20 Z0.3 F5000.0 ; Move over to prevent blob squish (added 20)

 

Option 2:

; Ender 3 Custom Start G-code without purge line

G92 E0 ; Reset Extruder

G28 ; Home all axes

G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed

G92 E0 ; Reset Extruder

 

 

Hope this helps a bit.

 

[stainl36 0]

I will give these a go shortly, after a particularly long microsd print is finished (which will house the rasp pi/octoprint). Hopefully get back shortly with results. Thanks

[GregValiant 983]

Another thing you might want to do is raise the Z first.  Right now your printer moves in a straight line from point to point.  You may want to insert a couple of other moves to make it an up-and-over.

G28

G0 Z15 F2000

G0 X.1 Y20

G0 Z.3

G1 X.1 Y200.0 Z0.3 F1500.0 E15 ; Draw the first NEW line

Edited March 25, 2022 by GregValiant