Initial Wipe

[Windworks 0]

My programs always have an initial start code that includes an extrusion of material to prepare the nozzle. Other printers and programs wipe this extrusion against the base plate, but my programs only leave it hanging to get caught into the print. How do I change it to wipe this material off or disable the extrusion?

MV4BIG60_Test3.gcode

[GregValiant 1,342]

That is typically a set of instructions that would be in the startup gcode.  Your Modix seems to be handling it in the firmware.

You might be able to get a wipe to work by adding some code to the StartUp Gcode (in Machine Settings).  How it works would be dependent on when the firmware is doing it's thing.

Go to Manage Printers, Machine Settings, and in the lower left textbox will be the StartUp Gcode.  If anything is in that box, copy it and paste it here.  It appears that the only thing in it might be a G28 for auto-homing.

[Windworks 0]

2 hours ago, GregValiant said:

That is typically a set of instructions that would be in the startup gcode.  Your Modix seems to be handling it in the firmware.

You might be able to get a wipe to work by adding some code to the StartUp Gcode (in Machine Settings).  How it works would be dependent on when the firmware is doing it's thing.

Go to Manage Printers, Machine Settings, and in the lower left textbox will be the StartUp Gcode.  If anything is in that box, copy it and paste it here.  It appears that the only thing in it might be a G28 for auto-homing.

 

G28 ; home all axes

 

This is all that it says. Is there something I could add to make it pass over the bed without having to measure it separately and risk damage if it happens to change? Also, is there also a setting to make the nozzle return to home afterwards or will that need to be programmed in?

Edited August 2 by Windworks
Added question

[Slashee_the_Cow 410]

5 hours ago, Windworks said:

Is there something I could add to make it pass over the bed without having to measure it separately and risk damage if it happens to change?

How is your bed likely to change? Or am I misunderstanding you?

 

The G28 is the only startup gcode in your printer's definition file (actually it's in the one it inherits from, but close enough). Hey @GregValiant, you wanna run a git blame to see who allowed that to ship? And it has two different extruder files where the only difference is the default name and number.

 

The definition for your printer included in Cura doesn't actually make it do a nose wipe. Or... much of anything. It just causes the printer to auto home and then gets straight in to the print. It doesn't even say your printer has a heated bed (and because of that, Cura won't try and heat the bed).

 

So the good news 🙂 is that it's not something you're doing wrong.

The bad news 😞 is that the definition included in Cura for your printer is so barebones it should be criminal.

 

8 hours ago, Windworks said:

My programs always have an initial start code that includes an extrusion of material to prepare the nozzle.

This startup gcode doesn't have any extrusions. It's probably just drooling while heating up.

 

6 hours ago, Windworks said:

Also, is there also a setting to make the nozzle return to home afterwards or will that need to be programmed in?

The startup gcode for most printers generally goes something like:

1. Start heating bed and hot end
2. Auto home
3. Run an auto bed levelling sequence or at least just make sure ABL is enabled (this only applies if your printer has it, of course)
4. Wait for nozzle to finish heating up
5. Go to corner and do nose wipe
6. Start printing

You should never need the nozzle to return to the home position after it finishes the auto home.

 

Here's the point where I wish I had a solution for you but without knowing more about your printer I can't really help rewrite the definition file. The author for the definition file is listed as Modix though you might want to contact their support to see if they have an updated version or something available.

[GregValiant 1,342]

That Modix Big60 printer can be ordered as a single-extruder "conventional" printer, or as a dual-extruder IDEX printer.  I would assume that's why it has the second extruder definition file.

As for how the StartUp can be adjusted - a "Modix specific" help site would be a better place to start.  Writing a Startup Gcode that would do what you want isn't difficult but actually having it work like you want might be.  It depends on how the firmware is configured.  It would appear that an "Auto-Level" firmware macro is being triggered by the G28.  It would be important to know if that is true.  I found some really old reviews (7+ years old) so when you find something make sure it's current.