Ender 3 with bltouch and runout sensor

thingiverse

I managed to compile the latest Marlin Bugfix 1.1.9 firmware with support for several key features, including BLtouch probe, bilinear bed leveling, filament run-out sensor, advanced pause feature, S-curve acceleration, junction deviation, linear advance, SD card support, power fail recovery, and thermal runaway protection. These files were edited by me in the original project: Configuration.h, Configuration_adv.h, and pins_MELZI_CREALITY.h. It was not easy to get all these features into firmware at the same time due to the small flash size on the Ender 3. To achieve this, I had to add compiler optimization parameters to the file "Arduino\hardware\arduino\avr\platform.txt": compiler.c.extra_flags=-fno-tree-scev-cprop -fno-split-wide-types -Wl,--relax -mcall-prologues compiler.c.elf.extra_flags=-Wl,--relax compiler.cpp.extra_flags=-fno-tree-scev-cprop -fno-split-wide-types -Wl,--relax -mcall-prologues I disabled some features of the firmware that are not important to me: STRING_CONFIG_H_AUTHOR SHOW_BOOTSCREEN CUSTOM_STATUS_SCREEN_IMAGE PID_AUTOTUNE_MENU DISABLE_M503 EEPROM_CHITCHAT SPEAKER BEEPER_PIN LCD_INFO_MENU STATUS_MESSAGE_SCROLLING SCROLL_LONG_FILENAMES ARC_SUPPORT NO_VOLUMETRICS EXTENDED_CAPABILITIES_REPORT All acceleration settings are increased from 500 to 1250. The extruder steps/mm setting is increased from 93 to 98. I configured the K-factor of linear advance feature to 0 in firmware, and it's necessary to configure it before every print in start G-code using a value of 0.7. I'm using this start G-code in Cura: M140 S[first_layer_bed_temperature] ; set bed temp M190 S[first_layer_bed_temperature] ; wait for bed temp M104 S[first_layer_temperature] ; set extruder temp M109 S[first_layer_temperature] ; wait for extruder temp M900 K0.7 ; Set linear advance K-factor G28 ; Home all axes M420 S1 ; Enable bed leveling M220 S100 ; Reset Feedrate M221 S100 ; Reset Flowrate G92 E0 ; Reset Extruder G1 Z2.0 F3000 ; Move Z Axis up G1 X10.1 Y20 Z0.28 F5000.0 ; Move to start position G1 X10.1 Y200.0 Z0.28 F1500.0 E15 ; Draw the first line G1 X10.4 Y200.0 Z0.28 F5000.0 ; Move to side a little G1 X10.4 Y20 Z0.28 F1500.0 E30 ; Draw the second line G92 E0 ; Reset Extruder G1 Z2.0 F3000 ; Move Z Axis up The BLTouch mount offsets are configured for this mount (X= -42, Y= -9): https://www.thingiverse.com/thing:3885541. The BLTouch servo signal is connected to pin 27, which is pin 1 on the LCD ribbon cable. The BLTouch end-stop signal is connected to pin 29, a hidden expansion pin close to an electrolytic capacitor. I removed the original capacitor and soldered a new one with longer legs. The black wire of the BLTouch (end-stop GND) is connected together with the brown wire (power GND). No need to remove C7 capacitor from Z endstop input. The filament run-out sensor is connected into an unused Z end-stop plug. If filament is present inside the sensor, contact is closed. I recommend changing the connection of the PCB cooling fan from a 2-pin plug connector to direct 24V on screw terminals. On stock connection, the PCB cooling fan is connected together with the hot end cooling fan. Because the hot end cooling fan is not always turned ON during the first layer, the PCB board may overheat if it's not cooled properly.