Dumb question.........and more letters

ok so this may sound dumb for someone who has a 3d printing farm and programs racing drones, but does anyone know why my tevo tarantula auto homes fine then purges the nozzle fine but then retracts? like it should prime and then print but no it primes and then retracts which defeats the whole point of priming.

all of that is likely in your start g-code

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ive went through it in cura and cant find it though

try here.

yeah ive been through all of the start gcode

G21 ;metric values

G90 ;absolute positioning

M82 ;set extruder to absolute mode

M107 ;start with the fan off

G28 X0 Y0 ;move X/Y to min endstops

G28 Z0 ;move Z to min endstops

G29;

G1 Z15.0 F9000 ;move the platform down 15mm

G92 E0 ;zero the extruded length

G1 F200 E3 ;extrude 3mm of feed stock

G92 E0 ;zero the extruded length again

G1 F9000

;Put printing message on LCD screen

M117 Printing…

is there anything in your extruder g-code?

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no its blank

that’s strange to have a retraction before a print starts, maybe if you examine the beginning of your g-code it might indicate where it comes from?

G21 ;metric values

G90 ;absolute positioning

M82 ;set extruder to absolute mode

M107 ;start with the fan off

G28 X0 Y0 ;move X/Y to min endstops

G28 Z0 ;move Z to min endstops

G29;

G1 Z15.0 F9000 ;move the platform down 15mm

G92 E0 ;zero the extruded length

G1 F200 E3 ;extrude 3mm of feed stock

G92 E0 ;zero the extruded length again

G1 F9000

;Put printing message on LCD screen

M117 Printing…

see any problms? @Glenn

everything there looks ok, or at least nothing that should cause it,

Only thing I can think is maybe “retract on layer change” is set and the M117 is tripping it? Technically the M117 is a new layer although the actual height never changes. You would be able to replicate it by printing 2 small items and see if it retracts between them when it does a move.

If you want to verify its an automated something doing it, Disable retractions, do nothing else, slice it and start the print. If it does not retract this time its cura doing it and not the start code.

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ill look at that tonight

its nothing in cura?

you mean nothing as the box is not checked?

So retractions are not enabled.?

I do have it enabled, I might just leave it alone for now and try a different slicer. cura keeps messing up for me.