Here's my config file:

;; ;; Folgertech FT5 Configuration ;; M111 S0 ; Debugging off G21 ; Work in millimetres G90 ; Send absolute coordinates... M83 ; ...but relative extruder moves M555 P2 ; Set firmware compatibility to look like Marlin M208 X0 Y0 Z0 S1 ; Set axis minima M208 X305 Y304 Z410 S0 ; Set axis maxima M574 Y2 X2 Z0 S0 ; Define microswitches M558 P5 X0 Y0 Z1 H5 F200 T6000 ; Set probe type G31 P500 X0 Y0 Z1.80 ; Set Z probe trigger value, offset and trigger height M584 X0 Y1:4 Z2 E3 ; Map to specific drives M569 P0 S0 ; Drive 0 - X M569 P1 S0 ; Drive 1 - Y M569 P2 S1 ; Drive 2 - Z M569 P3 S1 ; Drive 3 - E0 M569 P4 S1 ; Drive 4 - Y M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation M92 X80 Y80 Z399 E492.45 ; Set steps per mm M566 X1200 Y1200 Z60 E120 ; Set maximum instantaneous speed changes (mm/min) M203 X8000 Y8000 Z600 E1200 ; Set maximum speeds (mm/min) M201 X1500 Y1500 Z500 E250 ; Set accelerations (mm/s^2) M906 X1000 Y1000 Z1200 E900 I30 ; Set motor currents (mA) and motor idle factor in per cent M84 S30 ; Set idle timeout M143 S260 ; Set maximum heater temperature to 260C M305 P0 T100000 B3950 C0 R4700 ; Set thermistor + ADC parameters for heated bed (Heater 0) M305 P1 T100000 B4388 C0 R4700 ; Set thermistor + ADC parameters for E0 (Heater 1) M307 H0 A281.7 C430.4 D4.4 B0 ; Bed PID M307 H1 A344.7 C122.8 D5.5 B0 ; Hotend PID M307 H3 A-1 C-1 D-1 ; BLTouch M563 P0 D0 H1 ; Define tool 0 G10 P0 X0 Y0 ; Set tool 0 axis offsets G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C M550 PFT5 ; Set machine name M552 P0.0.0.0 S1 ; Enable network and acquire dynamic address via DHCP M106 P0 S0 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off M106 P1 S255 I0 F500 H1 T50 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on M106 P2 S255 I0 F500 H1 T50 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on T0 ; Select first tool

I home the hotend to back right of the printer (as standard for the FT-5) I set X & Y switch to high end so it's parked around 305. That gives me a front left corner of the bed X0 Y0, front right of Y0 X305 and back left of X0 Y305. In S3D i just tick flip Y build plate so every STL i load is usually the correct orientation ready to print 🙂