60mm LM8UU Linear Bush

Many parts use two lm8uu right next to each other. So I figure why not combine the parts into one. Also I changed the fins around so that there are internal "breaks" in the fins to allow for small compensations in misalignment in your printer. If the original fins were to span the entire length the self-centering effect would be minimized. Also I designed this to that with enough cooling even though there are breaks in the fins you should be able to print without support so you don't need to try