This is a two color design
If you don't have a printer with dual extruders you can still print this sign.
###Jump in the London metro. Blue line to Piccadilly Circus!
You have two ways to print this object:
Print the blue_part_slide and the red_part separately. Once printed the parts can easily be assembled by sliding the ring part into the central one.
Print the blue_part and the red_part together if you have a dual extruder. Center and align the parts in your printing software. Since the design is slightly different than the previous one it will not break when you detach it from the print bed.
Print with a high percentage of infill
###Please, MIND THE GAP!