This is a Screen Control Box that I made for my T-Rex 3 after I discovered that the Screen Control Box had an SD card Slot and a Reset / Stop Button inside it, but they were both covered over by the metal case.
Note that I do not know if all T-Rex 3's, or what Formbot machines have the SD card Slot in the Screen Control Box (I heard some 2's and 2+s do, but I cannot confirm this), or which ones that have them have active SD Card Slots. To find out one can simply unscrew the 4 front screws and try the SD slot if your machine has one "It should show up just like the rear SD Slot on the screen.) Also, on my machine the button says stop but seems to do a reset when pressed. This is handy if something goes wrong on the machine and you need to quickly stop the printer, but for all I know it may erase some settings, like for UBL.
To swap the case, simply unscrew the 4 front screws and transfer to the new box, making sure you keep the spacers on the PCB and don't forget to install the reset button (The print may need cleaning). Do not remove the 4 screws from the back of the PCB.
Have fun, but you do this at your own risk.
A video of my part can be seen here https://youtu.be/LACpIxUxQtg , and please subscribe to my YouTube Channel, and like my www.facebook.com/10psix page. :-)
To print this lay with the front / face down. I would use 100 percent infill for strength, and if possible use ABS or PLA+ A. PRINT FOR STRENGTH AND NOT FOR SPEED. A few places of the model have 45 degree angles, so make sure you set a speed where these can be printed neatly and for strength.
Please share photos of your prints when done.