Purge with mk3s. No room the 1st 1/2" to pop in and purge.

I have a Bondtech, so it's even larger.

I'm only working with prusaslicer at the moment. But I did a conditional lift...

{if layer_z < 20.0}
G1 Z20
{endif}

@james-tandy

Hi James,

Thanks for sharing your conditional lift command.

How are you inserting the purge commands into Slic3r PE?

Don't use this code as it's modified for a bondtech extruder but you can see the change and purge

this code -> T{next_extruder} .  signifies the extruder tool change. Everything before is before switch. Everything after, is after.

Gcode goes in Toolchange GCODE in Printer settings

G92 E0.0
;G1 E-50 F2100 ;retract

G91;Change to relative position
G91
{if layer_z < 15.0}
G1 Z15
{endif}
G1 Z5
M106 S0
G90

G1 E-15.0000 F7800
G1 E-24.5000 F1200
G1 E-7.0000 F600
G1 E-3.5000 F360
G1 E20.0000 F437
G1 E-20.0000 F417
G1 E20.0000 F396
G1 E-20.0000 F375
G1 E20.0000 F354
G1 E-20.0000 F333
G1 E20.0000 F312
G1 E-20.0000 F292
; SKINNYDIP START
G1 E32.0000 F1980
G4 P0
G1 E-32.0000 F4200
G4 P0
; SKINNYDIP END
G4 S0

T{next_extruder}

M900 K0.05
M221 S100
G28 X
G1 X200 F12000 ;move head into position
G4 S0 ;clear movement buffer
G1 X250 F12000 ;move head to purge zone
G1 X254.2 F1000 ;extend purge arm
M107 ;turn off fan
G92 E0 ;reset extrusion position
G1 E0.8 F2100 ;issue after retract
G92 E0 ;reset extrusion position
G1 E40 F200 ;1st purge extrude onto thumb tack
M106 S255 ;turn on fan
G4 S12 ;blob cooling
G92 E0 ;reset extrusion position
G1 E-0.8 F2100 ;retract extruder to prevent oozing
G1 X240 F12000 ;whack blob off tack 1
G1 X254.2 F1000 ;reset for another blob whack
G1 X240 F12000 ;whack blob off tack 2

G1 X200 F12000
G4 S0
G1 X250 F12000
G1 X254.2 F1000
M107
G92 E0
G1 E0.8 F2100 ;issue
G92 E0
G1 E40 F200 ;2nd purge
M106 S255 ;blob cooling
G4 S12 ;blob cooling
G92 E0
G1 E-0.8 F2100
G1 X240 F12000
G1 X254.2 F1000 F3000
G1 X240 F12000

G1 X200 F12000
G4 S0
G1 X250 F12000
G1 X254.2 F1000
M107
G92 E0
G1 E0.8 F2100 ;issue
G92 E0
G1 E40 F200 ;3rd purge
M106 S255 ;blob cooling
G4 S12 ;blob cooling
G92 E0
G1 E-0.8 F2100
G1 X240 F12000
G1 X254.2 F1000
G1 X240 F12000

G1 X200 F12000
G4 S0
G1 X250 F12000
G1 X254.2 F1000
M107
G92 E0
G1 E0.8 F2100 ;issue
G92 E0
G1 E40 F200 ;4th purge
M106 S255 ;blob cooling
G4 S12 ;blob cooling
G92 E0
G4 S0
G1 E-2 F2100 ;retract
G1 X240 F12000
G1 X254.2 F1000
G1 X240 F12000

@james-tandy

Thank you James. That's very helpful. We were thinking we may need to create a post processing script for Slic3r but this makes that very easy!

This will be added to the 'Retractable purge mechanism kit assembly procedure'  google doc.

Posted by: @bigbrain3d

@james-tandy

Thank you James. That's very helpful. We were thinking we may need to create a post processing script for Slic3r but this makes that very easy!

This will be added to the 'Retractable purge mechanism kit assembly procedure'  google doc.

That's probably the least painful option in terms of calculating volumes based on user preferences. I've already done a chunk of the work in a script I wrote for my own purge mechanism mod; if I could actually fit the mechanism to my printer I could adapt and share it :-/ (see my thread on Skelestruder compatibility)

@vintagepc64

That would be great. We replied to your other post about the skelestruder.