Allows for larger 2.2 lb rolls of filament rolls and keeps the filament centered on the spool while extruding. Thicker construction keeps filament holder from bending and keeps a more ideal filament angle, tangent to the spool.Open your choice of CAD modeling program (I'm using Autodesk Inventor) and grab your pair of calipers. Find all of the most critical dimensions such as the clip to hold it in place, the smallest inner diameter of spool, and the filament slot width in the holder. Identify the problems of the old part. In this case, it was a spool holder too narrow for a 2.2lb spool, a bending filament holder, and undue friction from a poorly aligned filament holder. Adapt the necessary dimensions that improve on the old design. Save as an STL and print like mad!