This is the moving speed of the axis when homing in [mm/min]. * When changing speed and direction, if the difference is less than the * value set here, it may happen instantaneously. Let us help you find the perfect settings. When I turn on the printer, connect to Pronterface and issue a G1 X10 y10 z10 E10 command everything works fine. Oftentimes in Marlin, speed or acceleration are expressed in [mm/s] or [mm/s2] but the feed is expressed in [mm/min]. Default printing speed: 100mm/s. M204 - Set default acceleration: S for print and retract, R for retract moves, T for travel moves (M204 S3000 T7000) in mm/sec^2. */ # define DEFAULT_XJERK 10.0 # define DEFAULT_YJERK 10.0 # define DEFAULT_ZJERK 0.3 # define DEFAULT_EJERK 5.0 The current default values are: I know there are default max feedrates but I'm not seeing a default set feedrate. Z Axis movement speed: 16.7mm/s. This makes it very hard for someone who has never configured Marlin before to set sane values. Higher speed means information can be transferred faster between PC and Marlin is one of the more popular firmwares available. When the z axis homes , it touches the endstop and moves up and homes again , but when moving down to home the second time , it moves extremely slowly , it takes 1 minute to hit the endstop again. Example. Solid Infill Underspeed: 60%. Stock Ender 3 will handle that no problem, I sling around a 1/4" thick bed at 1500 accel no problem at that speed. Discussion. Why does Marlin by default change the print speed when turning the LCD dial? It is the total number of axis (3) plus the number of extruders (1). Movement settings Define the number of axis. So set a maximum speed and do a test move along an axis, but make sure your host doesn’t artificially slow it down. In configuration.h the default values for acceleration and jerk are insane. Movement variables: M202 - UNUSED IN MARLIN. X/Y Axis movement speed: 120mm/s. To get the most out of your Ender 3 (Pro/V2), print speed is a key factor. A typical line of (depositing) G-code seems to set a maximum speed (F), a new position to move to (X, Y, Z) and a new extrusion distance (giving a filament distance for the move).The F is common for the line of code, and I understand gives a maximum for the XYZE combined speed.. My question is: "How is the extrusion rate synchronised to the movement distance and speed?" A firmware is the software which converts machine instructions (gcodes) into actual movements. ... Baudrate is the speed of the serial connection, by default 115200 or 250000. Check the default values in the Marlin as supplied with your machine and use these to start with. Support structure underspeed: 80%. I personally have spent the past six months hunting down extruder issues only to find out the problem was my E acceleration was way too high. Print quality was no different than 60mm/s. @thisiskeithb - tagging since you contributed the original profile for this printer Description Stock Marlin 1.1.9 with Ender 3 defaults results in fairly violent homing, causing the X and Y axis end switches to bottom out. Set max acceleration in units/s^2 for travel moves (M202 X1000 Y1000) M203 - Set maximum feedrate that your machine can sustain (M203 X200 Y200 Z300 E10000) in mm/sec. I recently upgraded my prusa i3 firmware to a newer version of marlin. How do you set the default feedrates for the motors in Marlin. You can also move the printhead to a position by using the G1 command with the desired position along the axis in mm and the desired speed in mm per minute, so that’s 60 times the speed you’d set in your firmware. #define NUM_AXIS 4. #define DEFAULT_MAX_FEEDRATE {500, 500, 5, 25} // (mm/sec) #define DEFAULT_MAX_ACCELERATION {9000,9000,100,10000} // X, Y, Z, E maximum start speed for accelerated moves. Line 330 Onwards. 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