added sponsors for https://www.thingiverse.com/thing:3467763

https://www.thingiverse.com/thing:3467763

to do this in 1 print just add this script for filament change in mid print:

.gcode:
;Filament change code below. Specify layer to swap filament. Print will pause and you can change filament, click LCD button to resume print.
;{REPLACE "; layer" "M117 Layer"}; show layer number and Z height on LCD
;{REPLACE " Z = " " Z="}; make room on LCD for text
;{REPLACE "\nM117 Layer 51, Z=" "\nG1 X10 Y5\nM300 S1000 P1000\nM0\nM117 Layer 51, Z="}; pause a