UPDATED! Heat and a poor design led to my bracket breaking & folding open. Version 2 has a better backbone.OEM clips only need 3 even with this upgrade I'll probably print 4 to spread out the weight. Two of the clips that hold the piece of vinyl that hides the track for my vertical blinds broke. So out came the calipers!Someone from the NoVA hackerspace community took pity and printed this for me. His tips:It clips right on. The attached image shows the original with some rough scale. I'll try to get some more of the new one with the original and in action