![]() It is one of the most undersold features of Marlin. In this article I’ve shown how to use firmware retraction. It might be enough to save a failing print though. Since it needs to override extruder movements, it might work a bit less efficient than true firmware retractions. Simply tap the “override” button at it will apply different retraction settings. It can’t undo Z-hops you enter in the slicer, but it can completely override the retractions. The basic principle on which it operates is that any retractions (which is expressed as a negative movement of the extruder) within a certain amount are overridden. Marlin calls this feature “auto retract”, I called this in the Community Firmware “override slicer retractions”. You can use this in the case you don’t want to or cannot use firmware retractions. There is also a way for Marlin to override existing retractions. The result of playing with multiple retraction settings during the same print Overriding slicer retractions Note that it may take a few moments for any changes to take effect. When tuning retractions, try playing with these parameters: On the firmware retraction screen you can change the most important parameters. On the touchscreen you can tap the “retraction” button in the bottom or navigate through “Tune -> Advanced tuning -> Retractions”.ĭid you know you can actually tap anything in the footer to either navigate to the relevant screen or change the value? Then, slice your typical retraction test and start the print. I also recommend you add this to your start gcode, so the slicer retraction settings are set as default for the firmware retraction feature: Setup firmware retraction settings In PrusaSlicer you can find the firmware retraction setting in the “General -> Advanced” section. ![]() Marlin then does a retraction and optional Z-hop.įirst you need to configure your slicer to emit firmware retraction commands. ![]() The slicer enters gcode G10 any time a retraction is needed and gcode G11 at the end of the travel move. Retractions can sometimes be burned away - but they will always leave some marks on a print Enter firmware retractionįirmware retraction allows you to control any retraction parameters during a print. Retraction tuning can drive you crazy and needs a lot of manual slicer work if you want to try multiple parameters. You may find you need to adjust multiple parameters to prevent oozing: This causes the classic “lightning” arcs you see in a stringing test.ĭifferent filaments have different retraction behaviors. The worst thing is that stringing can cause more stringing, because when the nozzle hits stringing on the next layer more filament is pulled out. If retraction is not sufficient (assuming the filament is decent), then you “bridge” a small amount of filament across the travel move. Generally a retraction is done before a travel move. The retraction reduces pressure in the nozzle. Tuning retractions while a print is running with Community Firmware release 6Ī retraction during 3D printing is the act of pulling back filament in order to prevent oozing of filament out of the nozzle. In this article I show you how to use it! ![]() ![]() Marlin supports adjusting retractions while a print is running - when you have “firmware retraction” enabled. You can also use it save a print that experiences too much stringing. The ability to adjust retractions during a print is invaluable when tuning in new filaments. ![]()
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