Outer mounting upper vertexes for your MendelMax plus an integrated spool holder. I designed these pieces as I felt that the original pieces got in the way and I also was lacking a spool holder. The ridges were designed in as I had an existing zip-tie that could not be moved, I think it adds a nice decorative touch. The spool holder is designed to be used with a "repraper" spool. Printed with 0.2mm layers.