These are legal alliance markers for the First Tech Challenge Robotics competition. Use Velcro to attach the markers to the mounting plate, so that the can be easily swapped out. You can add Velcro on the other side of the mounting plate if you want, in order to hold your spare markers while you aren’t in a match. Just make sure that the extra markers get removed before you start your match. The mounting plate can be attached to 15 mm extrusion with m3 bolts. 

Printing:

I printed them out of PLA at 15% infill. Print the  markers with red and blue filament and the mounting plate out of any color filament.

You will need to print two of each file.

These files were created by FTC team 15083.