The camshaft caps didn't really want to fit properly and kept popping loose on my print, since the original model has holes on the heads and the cam caps I figured I'd make a brace to fit it.

Required materials

(Recommended): 4mm drill

Print instructions

Print oriented as provided, use PLA/PETG or anything stiff, 4+ walls/top/bottom.

Installation instructions

If you are assembling the heads for the first time, take this moment to ensure the holes are 4mm in diameter using your favorite drill, do this on both the head and the cam caps to make sure the braces will fit. If you've already installed the cam gears, you'll need to take them off before installing these braces.

After you install the camshafts and cam caps, but before installing the cam gears, press the braces into the four holes, securing the bearings in place, press the cam gears onto the shafts before continuing the rest of the engine assembly.

Tip: If for some reason you try to remove these and the pins break off and get stuck, drill out the center with a 2mm drill bit and use a small screwdriver to twist/pry the broken pins out, that worked for me.