gMax 1.5+ Marlin 1.1.9 - SSR Heated Bed Firmware 210414

License Type
Original Authors License
Compatible With
gMax 1.5+
Marlin 1.1.9 Firmware - SSR Heated Bed

Only use with the gMax SSR addon and new heated bed. This will not work with the external gMax 1.5+ Keenovo control box without modification.

Update 4/14/2021 : First Upload
+ Added Heated Bed via printer Control
+ LED light bar (case light ) controls

For use with the gMax 1.5+ and gMax 1.5 XT+ 3d printer with new SSR heated bed upgrade. The external Solid State Relay (SSR) allows the heated bed to be controlled by the printer using PID tuning as well. It also allows for the gMax LED light bar to be controlled by the printer.


The new firmware includes .hex files and you can use Xloader to install the precompiled .hex files straight to the printer.
  1. First connect your printer to the computer using supplied USB cable.
  2. Download the program and select the correct .hex file you wish to upload.
  3. Make sure to select the Com port where your printer is located and set the baud rate to 115200

Additionally you can upload using Cura slicing software. Refer to this tutorial for a simple walk through on installing firmware with Cura:
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