These small clips mount on the diagonal front piece of the Replicator Hood by Dave Randolf: http://www.thingiverse.com/thing:23386I love this hood, but one of the minor annoying things was that the sloped piece on the front sagged a little bit, since it was unsupported except at the edges. These clips join the sloped piece to the top and front at a couple of points, fixing the sag and any vibration of that piece. In addition, the lower clips have an extra slot, that can be used to hold the front cover out of the way when it is removed.I was really surprised that this improves the rigidity of the hood dramatically. It's a must-do if you have one of Dave's hoods.Nothing special to print. The major issue is that you have to remove one of the sides of the hood to slip the clips in. If you assembled the hood, you probably know enough to tape the nuts in place before removing the side. Note that the clips only logically fit in place one way, the hood edges won't match if you try to place them in backwards. The lower edge clips are obvious since they have the extra slot to hold the front cover.