How to retract filament after print ( Ender 3 & Cura ) + gcode

thingiverse

This is a small tip for those who ask how to automatically retract the filament after the print on printers that don't have the automatic unload function like the ender 3, in order to be able to remove the spool without having to re-heat the nozzle again after printing. The key is to set gcode to retract the filament by 25mm. This is enough to separate the PLA or PETG filament from the nozzle when cold but it will also allow you to start another print without have to reinsert the filament (if will charge it during the first test line) There are three possible methods, first and second are tested with PLA and PETG, for TPU you have to use the 3rd method or extend the retraction distance on the first two methods due to the elastic material properties. - Classic method (1st pic): On Cura menu click on Settings->Printer->Manage Printers->Machine Settings under the End G-code modify the string: G1 E-2 F2700 ;Retract a bit to: G1 E-25 F2700 ;Retract a bit - Quick edit method (2nd pic): Click on Extensions->Post processing->Modify g-code Add the "Search and Replace" Script Enter "G1 E-2 F2700 ;Retract a bit" into "Search" field Enter "G1 E-25 F2700 ;Retract a bit" into "Replace" field It will allow you to quick disable or edit it by just click on the tools icon on the left of the Cura slice button without having to enter into the machine setting menu. - Launching from printer (gcode) method (3rd pic): Download the attached REMOVE FILAMENT gcode file and keep it into your printer SD card. Launch it like a normal print when you want to remove the filament. It will heat the nozzle to 190°, retract the filament and then cool down the nozzle again. For safety reasons it will keep the filament inserted for the last 2cm and a beep will alert you after job done. You can edit it with the notepad if you need. If it doesn't work try to restart your machine. All tested on the Creality Ender 3 printer Hope that will help ;)