A quick modification of @brendan.m.bone 's self centering AMS roller.

This remix breaks the roller in half, and adds slots for pins to be used, to aid in assembly.

This is an improvement over the original design, as it required you to print two lateral halves and glue together, which may result in a not-so-round roller.

Simply print as shown, and insert the pins into the top and bottom of one roller, and then insert the second roller into the first, and top with the 3rd pin, then assemble for the AMS as per the original model.