So set a maximum speed and do a test move along an axis, but make sure your host doesn’t artificially slow it down. Discussion. Movement settings Define the number of axis. Homing feed rate. A firmware is the software which converts machine instructions (gcodes) into actual movements. @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. * When changing speed and direction, if the difference is less than the * value set here, it may happen instantaneously. In configuration.h the default values for acceleration and jerk are insane. 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. When I turn on the printer, connect to Pronterface and issue a G1 X10 y10 z10 E10 command everything works fine. Support structure underspeed: 80%. Outline underspeed: 40%. #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. I recently upgraded my prusa i3 firmware to a newer version of marlin. Solid Infill Underspeed: 60%. 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 NUM_AXIS 4. 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. ... Baudrate is the speed of the serial connection, by default 115200 or 250000. Z Axis movement speed: 16.7mm/s. I’ve always considered it weird that on the top level of the marlin LCD, if I turn the dial, I can fine adjust the speed of printing. It is the total number of axis (3) plus the number of extruders (1). Check the default values in the Marlin as supplied with your machine and use these to start with. 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. Why does Marlin by default change the print speed when turning the LCD dial? I know there are default max feedrates but I'm not seeing a default set feedrate. Marlin is one of the more popular firmwares available. 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. Line 330 Onwards. 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. 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?" Let us help you find the perfect settings. Print quality was no different than 60mm/s. X/Y Axis movement speed: 120mm/s. */ # define DEFAULT_XJERK 10.0 # define DEFAULT_YJERK 10.0 # define DEFAULT_ZJERK 0.3 # define DEFAULT_EJERK 5.0 Stock Ender 3 will handle that no problem, I sling around a 1/4" thick bed at 1500 accel no problem at that speed. This makes it very hard for someone who has never configured Marlin before to set sane values. How do you set the default feedrates for the motors in Marlin. Example. This is the moving speed of the axis when homing in [mm/min]. Movement variables: M202 - UNUSED IN MARLIN. 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