This is a little clip to attach a valance to a window blind. These pesky things go missing or break and are hard to find. Now you can just print a new one.This little clips are out of sight when in use, so print at 0.3 mm resolution. I print with a 4 mm brim to keep the part from popping off the table when printing, as differential cooling can cause it to flex while being printed. Print flat to the table. Snap off the brim and mount as you would the stock part. This part is calibrated in inches so remember to import as such into your slicer program.