I printed this today, in about 45 min time. Just fast enough to be able to take to work with me! Great fun to play with, when things are slow. With so many of these gimbal mechanisms, I’ve seen them loose enough that the slightest movement will dislodge the inner rings. I went with the larger file, and the tolerances are plenty enough so that the inner rings have no trouble with staying in. This is a great build for beginners (like me), and can provide great amusement! Printed on Ender 3 S1