With this upgrade z wobble will desapear and X axis distance will increase up to 325mm 13/01/2015 - I reduced the ultra high quality of the .stl to high quality and I fix an error with the endstop x attachment. 03/02/2015 - I've make a new electronic support for this mod because I remove the original aluminiu plates. 02/03/2015 - I've upload the lower vertex support called (Suport roscada) because some users had asked for it. I repeat again that this part will make Z wobble so it's better without it. 19/03/2015 - Improved fixing buishing and the x axis bars to "guia_z_motor" and "guia_z_no_motor". Also improved interior desing for the endstop z screw.You only need another shaft for each side of Z axis and an open end GT2 belt. Show you which I bought: http://reprapworld.com/?products_details&products_id/403/cPath/1655