HMDVR-S piggyback mount for BR2.5 frame

thingiverse

Print on side with triangles pointing upwards, supported by ABS. Easy quick print. To use, push the button with either a match or thin hex key. Alternatively, insert a length of filament, flare one end, then use another length heated and bent into a U-shape to melt into place, securing the pushing length in position. This unorthodox method surprisingly worked effectively.