Standing number markers

Created to be distance markers on a sports field. I printed mine with PETG signs and epoxied them to TPU couplings.
- Change filament at layer 12 if using two colors.
- On my BambuLab A1 I turned off "Prime Tower : Enable" so I could use the full size of my build plate.

The clip (number_sign_clip) provides an easy way to set them up and take them down without much storage space.
The two couplings (number_sign_coupling, stronger_number_sign_coupling) create a permanent structure. I printed mine with TPU to be flexible enough that the sign won't snap if lightly impacted. The stronger version is useful for TPU when the signs are placed on smoother surfaces so the bottoms do not spread as much.

** Update 2026-01-27 ** Added a G sign for the goal line. Turns out athletes are more likely to try harder to cross that line than any other in a therapeutic setting.