Cannot build up pressure fast enough at beginning of print
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Hello all,
I don't know if this is a Duet Wifi issue or a slicer setting I am missing but maybe someone here can help.
Every time I start printing it takes quiet a while for pressure to build up. Most of the time the filament only comes out of the nozzle in a continuous stream once the first layer is started even when using a skirt. I have tried Prusa Slicer as well as Cura both with 0 mm retraction but I cannot get rid of the issue. In Cura there is gcode that is executed after each print which retracts the filament 2 mm. In Prusa Slicer there is none (I use most of the default settings). I do not have pressure advance enabled.
Any suggestions?
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@knicklicht look in your print_end.g .Do you have retraction in there?
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@R4ffers I don't have that file in my system directory. However, there is a 10 mm retraction in pause.g and stop.g is empty
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@knicklicht Look for anything which might do a large retraction at the end of a print. That could be in the slicer end gcode. Are you using absolute or relative extrusion? If you are using absolute or switching to absolute, then a move such as for example, G1 E-10 will retract all the filament which had been extruded since it was last zeroed plus10mm, rather than retracting it by 10mm. Are you using a large nozzle? If so, it is possible that any filament in the hot end is oozing out as the hot end cools, so the next print has to first replenish the hot end before anything comes out of the nozzle. Without more information, I can't think of anything else. Suggest you use the mark 1 eyeball to see what happens to the filament at the end of a print and at the start of a new one.
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@knicklicht the simplest option may be to increase the setting in Prusa Slicer for the minimum length of filament to be extruded for the skirt. I was having the same issue with small prints on one of my printers and that's how I fixed it.
Alternatively, put code in either the slicer start GCode or start.g to print a prime line.
