Customized version of http://www.thingiverse.com/thing:94018

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=94018

Using the following options:

clip_thick = 3
height = 1
clip_tooth_size = 1
offset = 0
text = R M F
clip_tooth_spacing = 6
clip_front_length = 60
font = write/Letters.dxf
clip_height = 8
clip_back_length = 45
vOff = 0
clip_width = 9