After watching the great triffid_hunter design I adapted mine in order to fit a Sells Mendel.This is a nice addition that simplifies the printer, saves vitamins and contributed to a better world.Print two copies and remove up to 8 plastic pieces from your Sells Mendel, as seen in the picture.Using this design converts your mendel in something more like the prusa, and also gets rid of the annoying Z axis belt. Of course you will need an extra NEMA 17 stepper.