This is a carrrier that interfaces with http://www.thingiverse.com/thing:237822 that holds the springs and bolts instead of the rubber hose, for those so inclined. The .stl may have some issues, every time I send it to netfabb it comes back with holes. Maybe someone with more skills and a better program than sketchup can fix it. But you get the idea. Bolt holes are 12.5mm apart and the aitripper itself does not need any modification.
Note - updated by Highcooley to fix the slicing issues in the camshaft. See igf 'Cam 3rd Try " works. Kurt updated the camshaft , this time I think we have it .
I designed this so there was support for the cam base circle from one side, so print it standing up with that on the lower side. The counterbores for the springs and the holes for the 3mm x 50mm bolts do not need any support if you print it standing on one end so the holes are horizontal.. Since it is under pressure all the time use a dense infill so it is strong. The idler arm that holds the 608ZZ bearing is the same as the Airtripper , but I enhanced it a little by making the walls next to the slots taller so the cam carrier has more area to push against.