The 3D model from OpenSCAD or another 3D design program has to be turned into concrete instructions for the 3D printer.
A so-called slicer takes care of this; on the whole I've had good experiences with the free Ultimaker Cura.
After installing a new version on Windows 10 it sometimes takes a while for a window to appear. As a last resort I've even set the compatibility mode to Windows 8 — but maybe I was just too impatient ;)
My settings for the Anycubic i3 Mega 3D printer
Start G-code
G21 ;metric values
G90 ;absolute positioning
M82 ;set extruder to absolute mode
M107 ;start with the fan off
G28 X0 Y0 ;move X/Y to min endstops
G28 Z0 ;move Z to min endstops
G1 Z15.0 F{travel_speed} ;move the platform down 15mm
G92 E0 ;zero the extruded length
G1 F200 E3 ;extrude 3mm of feed stock
G92 E0 ;zero the extruded length again
G1 F{travel_speed}
M117 Printing...
G5
End G-code
M104 S0 ; turn off extruder
M140 S0 ; turn off bed
M84 ; disable motors
M107
G91 ;relative positioning
G1 E-1 F300 ;retract the filament a bit before lifting the nozzle to release some of the pressure
G1 Z+0.5 E-5 ;X-20 Y-20 F{travel_speed} ;move Z up a bit and retract filament even more
G28 X0 ;Y0 ;move X/Y to min endstops so the head is out of the way
G1 Y180 F2000
M84 ;steppers off
G90
M300 P300 S4000
