Important information related to BigTreeTech's TFT touchscreen 3D printer controllers
Only the TFT's listed below are currently supported. Trying to install the firmware on a TFT which is not supported can harm the hardware.
BTT_TFT24_V1.1
BTT_TFT28_V1.0 and V3.0
BTT_TFT35_V1.0, V1.1, V1.2, V2.0, V3.0, E3_V3.0 and B1_V3.0
BTT_TFT43_V3.0
BTT_TFT50_V3.0
BTT_TFT70_V3.0
MKS_TFT28_V3.0 and V4.0
MKS_TFT32_V1.3 and V1.4
Firmware source: https://github.com/MarlinFirmware/Marlin
Minimum Marlin firmware version: 2.0.5.4/Distribution date: 2020-05-12
Recommended Marlin firmware version: bugfix-2.0.x/Distribution date: 2021-04-11
In order the TFT firmware is able to provide all of its functionalities/features, ensure that the following options are enabled in Marlin firmware.
General options:
EEPROM_SETTINGS (in Configuration.h)
AUTO_REPORT_TEMPERATURES (in Configuration_adv.h)
M115_GEOMETRY_REPORT (in Configuration_adv.h)
M114_DETAIL (in Configuration_adv.h)
REPORT_FAN_CHANGE (in Configuration_adv.h)
Options to support printing from onboard SD:
SDSUPPORT (in Configuration.h)
LONG_FILENAME_HOST_SUPPORT (in Configuration_adv.h)
AUTO_REPORT_SD_STATUS (in Configuration_adv.h)
SDCARD_CONNECTION ONBOARD (in Configuration_adv.h)
Options to support dialog with host:
EMERGENCY_PARSER (in Configuration_adv.h)
SERIAL_FLOAT_PRECISION 4 (in Configuration_adv.h)
HOST_ACTION_COMMANDS (in Configuration_adv.h)
HOST_PROMPT_SUPPORT (in Configuration_adv.h)
Options to support M600 with host & (Un)Load menu: (Options to support dialog with host as pre requisite)
NOZZLE_PARK_FEATURE (in Configuration.h)
ADVANCED_PAUSE_FEATURE (in Configuration_adv.h)
PARK_HEAD_ON_PAUSE (in Configuration_adv.h)
FILAMENT_LOAD_UNLOAD_GCODES (in Configuration_adv.h)
Options to support Babystep menu:
BABYSTEPPING (in Configuration_adv.h)
Options to support repeatability test to test probe accuracy (M48):
Z_MIN_PROBE_REPEATABILITY_TEST (in Configuration.h)
Options to support alignment of multiple Z steppers using a bed probe (G34):
Z_STEPPER_AUTO_ALIGN (in Configuration_adv.h)
Do the following, to be able to use the touchmode of your screen.
- Connect the 5pin serial cable according to the manual of your mainboard.
- Define a serial port in Marlin, to activate the port used by the TFT.
- Make sure the same BAUDRATE is defined in Marlin and the firmware of your TFT (config.ini)
In case one of the three points above is not done right, "No printer attached" will be shown at the top of the screen in touchscreen mode. This is because the TFT can not "see" the mainboard through the serial cable.
Do the following, to be able to use the Marlin emulation mode of your screen.
A: In case your TFT does not have an EXP connector at all (TFT28 v1 for example), you can not use the Marlin emulator mode.
B: In case your mainboard provides EXP1 and EXP2, you have to connect 2 ribbon cables connecting EXP1 and EXP2 of the mainboard to EXP1 and EXP2 of the TFT. In the Marlin firmware of your mainboard, make sure that ONLY the "REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER" is activated in Configuration.h and that all other controllers are Deactivated (especially the "CR10_STOCKDISPLAY").
C: In case you have an "E3" mainboard which provides a single EXP connector, you have to connect 1 ribbon cable connecting EXP of the mainboard to EXP3 of the TFT. In case your TFT does not provide an EXP3 connector but only two 10pin connectors (TFT24 v1.1 for example) you will need a "Y-split" cable with one 10pin connector on one side (for the mainboard) and two 10pin connectors on the other side (for the TFT). In the Marlin firmware of your mainboard, make sure that ONLY the "CR10_STOCKDISPLAY" is activated in Configuration.h and that all other controllers are Deactivated (especially the "REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER").
This chart has been provided by user Thomas White
| Status Screen DISABLED | Status Screen ENABLED |
|---|---|
 |
 |
| In config.ini define: General Settings Enable Status Screen # Select the Main Screen flavour # Options: [Enable: 1, Disable: 0] status_screen: 0 |
In config.ini define: General Settings Enable Status Screen # Select the Main Screen flavour # Options: [Enable: 1, Disable: 0] status_screen: 1 |
| Unified Menu Theme | The Round Miracle Theme by Acenotass |
|---|---|
|
 |
Use firmware, icons, and fonts from the Copy to SD Card root directory to update - Unified Menu Material theme folder |
Use firmware, icons, and fonts from the Copy to SD Card root directory to update - The Round Miracle theme folder |
| Hybrid Red Material Theme by AntoszHUN | Hybrid Mono Material Theme by bepstein111 |
|---|---|
 |
 |
Use firmware, icons, and fonts from the Copy to SD Card root directory to update - Hybrid Red Menu Material theme folder |
Use firmware, icons, and fonts from the Copy to SD Card root directory to update - Hybrid Mono Menu Material theme folder |
The TFT firmware update is done in three steps and includes up to four elements:
element 1: The firmware binary (BIGTREE_TFT*_V*.*.*.bin). Example: BIGTREE_TFT35_V3.0.27.bin:
BIGTREE_TFT_35: modelV3.0: hardware version27: software version
Exception: For the MKS TFT28 the binary file name must be MKSTFT28.bin.
Attention TFT35 owners. There are currently three different kinds of firmware available: V3.0, E3_V3.0 and B1_V3.0. Please make sure to use the firmware which matches your TFT screen.
element 2: Fonts and Icons (in the TFT* or MKS folder):
For BTT TFTs, the ROOT folder for fonts and icons is TFT*, where * is the size of the TFT (example: TFT24, TFT35, TFT50, etc). Fonts and icons folder structure:
TFT*/font: fontsTFT*/bmp: icons
For MKS TFTs the ROOT folder for fonts and icons must be renamed to "MKS". Fonts and icons folder structure:
MKS/font: fontsMKS/bmp: icons
element 3: The config.ini or config_rrf.ini file
element 4 (optionally): One or several language file(s)
step 1: Copy your self compiled firmware or the BIGTREE_TFT*_V*...bin, plus the TFT` folder* of your preferred Material theme as well as the config.ini (or config_rrf.ini) to the root of a blank SD card that is <8GB and formatted as FAT32:
Optionally, copy one or several language.ini file(s) from Copy to SD Card root directory to update/Language Packs folder onto the SD card. Doing so will allow you to switch between English and the uploaded language(s), using the corresponding Language function of the TFT. We recommend to upload the minimum amount of languages, to keep the memory usage low. The language.ini file can be edited to change the text shown on the TFT.
step 2: Place the SD card with the BIGTREE_TFT*_V*.*.*.bin, theTFT* folder and the config.ini into the TFT's SD card reader and reset your TFT (or optionally - power cycle your printer) to start the update process.
A successful update looks like this on the screen:
... and the name of the elements on the SD card changes to this:
In case one or several parts of the update failed, an error will be shown. Follow the information on the screen to update the missing or outdated elements.
After the update is done and the files are renamed, it is possible to reuse them again. To do so, change the name of the element(s) to the pre-update name and start the update process again.
step3: Remove the SD card from the TFT and restart the printer.
Tip: Format the SD card after the firmware update in case you would like to print from it.
Sometimes a calibration will be executed automatically after a firmware update, showing a white screen with a red dot in the upper right corner and the text: Touch Screen Calibration - Please click on the red dot. To calibrate the screen press with your finger or a stylus the red dot in the upper left corner, then the red dot in the upper right corner and then the red dot in the lower right corner. Even the screen asks you to press the red dot, press the black dot in the middle of the screen to finish the calibration. Repeat the process in case the message: "Adjustment failed, please try again" is shown
The Firmware can be modified by changing the config.ini or config_rrf.ini file from: Copy to SD Card root directory to update using a simple text editor (make sure to use UTF encoding).
Once saved, it can be uploaded without the need to upload the firmware or the TFT folder again, as long as the firmware and the config file are from the same version.
To edit the config file follow the instruction here: Detailed Instructions here
To update the Firmware configuration:
-
Edit the settings like described above
-
Copy the config.ini or config_rrf.ini file to the root of the SD card. (The SD card capacity should be less than or equal to 8GB and formatted as FAT32)
-
Insert the SD card into the TFT's SD card slot and restart the printer or press the reset buttion of the TFT.
-
The TFT will update and store the configuration from the configuration file.
-
Make sure to remove the SD card from the TFT and restart the printer.
-
On the TFT click on Menu - Settings - Feature and navigate to the last page. Click on
"Reset default settings ..."
-
Restart the printer to finish the update
See Customisation guides for detailed information.
View full instructions
- Setup Visual Studio Code with PlatformIO instructions
- Click on the PlatformIO icon (①) and then click on Open Project (②):
- Find the BIGTREETECH firmware source directory , then click Open:
- After opening the project, edit
platformio.iniand change thedefault_envsto one that matches your TFT model and version:;BIGTREE_TFT35_V1_0 ;BIGTREE_TFT35_V1_1 ;BIGTREE_TFT35_V1_2 ;BIGTREE_TFT35_V2_0 ;BIGTREE_TFT35_V3_0 ;BIGTREE_TFT35_E3_V3_0 ;BIGTREE_TFT28_V1_0 ;BIGTREE_TFT28_V3_0 ;BIGTREE_TFT24_V1_1 ;MKS_TFT32_V1_3 ;MKS_TFT32_V1_4 ;MKS_TFT32_V1_4_NOBL ;MKS_TFT28_V3_0 ;MKS_TFT28_V4_0 [platformio] src_dir = TFT boards_dir = buildroot/boards default_envs = BIGTREE_TFT35_V3_0
- Click the check mark (✓) at the bottom of VSCode or press
Ctrl+Alt+B(Windows) /Ctrl+Option+B(macOS) to compile.
- A
BIGTREE_TFT*_V*.*.*.binfile will be generated in the hidden.pio\build\BIGTREE_TFT*_V*_*folder. Follow the update process outlined in the About TFT Firmware section above to update your TFT to the latest version.
Tip: In case there is a problem compiling the TFT firmware try to restart VSC. If this does not help and you are using macOS, delete the packages and platforms folder which you can find here: /Users/username/.platformio/.
In case the upload of a new firmware failed
First, verify that you have been using the correct version for your TFT. After that, try to upload the new firmware again (like described above) using a new SD card - 8GB or smaller, FAT32 formatted. Some uploads worked fine after executing a low level format of the SD card and not a quick format.
Simple Reset
To reset the TFT's touch screen calibration, create a blank file named "reset" with the file-extension "txt", and place it in the root folder of an SD card (the SD card capacity must be less than or equal 8GB and formatted as FAT32). Insert the SD card into the TFT's SD card reader and power cycle your printer or restet your TFT to start the reset process.
Worst Case Scenario
In case the screen remains black or the brightness is not stable, the screen does not react after pressing a button or executes clicks by itself or does something similar - and the reset described above did not help - do the following. Remove the TFT from the enclosure and disconnect everything from the TFT, including the cable to the mainboard. Cut a USB cable you do not need anymore and connect the red and black wire to 5V and GND of the TFT. Do not use the unshielded wires directly but use a 2 pin connector instead. Power up the TFT and try to reset the TFT or to instal a new firmware like described in this document. With only power supplied, you should be able to navigate through the menus using the touchscreen and even to switch to Marlin Emulation (if available), even the Marlin Emulation screen will not show the interface with a proper EXP based connection.
See BIGTREETECH-TouchScreenFirmware/releases for a complete version history.
The following mainboards are covered by this document.
MKS GEN_L v1.0, MKS SGEN (LPC1769), MKS SGEN_L v1.0 (LPC1768) and MKS SGEN_L v2.0 (LPC1769)
Connections
The TFT35 E3 V3.0 has 3 cables to connect to the mainboard. Two 10 pin ribbon cables and one 5 pin serial cable. The 2 ribbon cables connect to the EXP1 and the EXP2 connections on both the TFT35 E3 V3.0 and the MKS mainboards.
The RS232 cable is connected to the RS232 connection on the touchscreen, with the other end connecting to the AUX1 connection on the mainboard. The RS232 cable has 5 wires. One end has a single 5 wire connector that goes to the RS232 connector on the touchscreen, and the other end has two connectors, one has 4 wires, and the second one has one wire. That single wire is for the Reset and is not used on these MKS mainboards. The 4-pin connector plugs into the AUX1 connection. It must connect to the top row of pins when looking at the socket with the notch facing away from the mainboard and must be also plugged in with the 5v+ wire connected to the first pin in the upper left corner of the socket. The RESET wire is not connected to anything.
NOTE: On the MKS mainboards there is an issue that involves at least the MKS GEN_L, MKS SGEN, and MKS SGEN_L models. The EXP1 and EXP2 connections have the socket shell installed wrong way around. The notch that indexes the cable should be facing towards the mainboard. If you get a blank screen on the TFT35 E3 V3.0 touchscreen after connecting the two EXP cables and turning the printer on, turn printer off and disconnect the 10 pin cables from either the touch screen or the mainboard and using small diagonal cutters trim the tab down to be as close to flush as you can get on both cables (and only on one end) and plug them back in with the trimmed tab now facing the mainboard.
The second workaround for this issue is to carefully pry the two shells surrounding the pins on the mainboard upwards until they clear the pins. Do NOT use a metal tool for this, use a sturdy plastic or whalebone prying tool. Turn the shell 180 degrees and align the pins with the holes in the shells and push the shells back on with your thumb. Do not push the shell back on with something that could cause damage if it were to slip. Once the shells are installed you can use the stock (unaltered) cables as they are.
Firmware
Edit the configuration.h file and enable the line that says: #define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER Rebuild and deploy the Marlin firmware to your 3D Printer.
Statistics as filament length, filament weight and filament cost can be embedded into the gCode. After the print is finished there will be an infobox that you can click and a popup will present you the printed filename (limited to the first 25 characters), the time needed for the print, the filament length used, the filament weight and its cost. In the case of multi-filament usage the statistics will show the sum of all individual data (sum of length, sum of weight, sum of cost). The statistic data in the gCode must have the following format (a good practice would be to include this at the beginning of the gCode):
M118 P0 filament_data L:{12.3456}mL: represents the length in metersM118 P0 filemant_data W:{1.23456}gW: represents the weight in gramsM118 P0 filament_data C:{0.1234}C: represents the cost without a unit
The values of every filament data can be in a brackets, parentheses, apostrophes, etc. or without them, measurement units can be there or not.
So M118 P0 filament_data L:(12.3456)m, M118 P0 filament_data L:12.3456meters, M118 P0 filament_data L:[12.3456] and so on are all valid formats.
For multi-filament print statistics the data for each used filament should be written, they can be separated by comma, space, asterix, whatever, except ";" and ".".
Examples for multi-filament:
M118 P0 filament_data L:(12.3456, 8.2520974)mM118 P0 filament_data W: 24.87652 15.568264 grammM118 P0 filament_data C:[1.3456], [0.56024]
The inclusion of the filament data into the gCode can be automated. In Cura all you have to do is to insert the following into the Start G-Code:
M118 P0 filament_data L:{filament_amount}mM118 P0 filament_data W:{filament_weight}gM118 P0 filament_data C:{filament_cost}
In case the gCode file has been generated using the BTT 3D Plug-In Suit, the data is automatically added.
In case filament data is not present in the gCode, the filament length data is calculated during print. Length is calculated regardless of using the TFT USB, TFT SD or the onboard SD. Calculations are done in both absolute or relative extrusion mode. Filament data takes into account the flow rate also but with a caveat. It has to be the same flow rate during the entire time of the printing, because the end result is calculated based on the flow rate at the time the print has finished. If flow rate changes during the print the results will not be accurate anymore.