Printrbot Simple 1405 "TRI ROD MOD" with or without XL tower upg

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This mod adds a third linear rod in both Y and Z axes, reducing twisting significantly, especially when combined with an extended Y mod. Based on Jon Lawrence's 300mm no sag mod, it includes modifications from other works listed in the remixed from section. UPDATE (12/13/2014): After printing TRI_ROD_MOD_TOP1_XL, I found the model didn't fit due to incorrect XL wood parts models. Measured my actual wooden XL parts and redesigned this part for a correct fit. Also beefed it up. UPDATE(2/13/2015): Uploaded new step file with non-XL version parts. Separate step files are available for 2 biggest parts, verified importable in FreeCad. P.S. A basic hardware list will be worked out soon. P.P.S. I'm working on another version integrating into JONbot, incompatible with this one. XL tower parts will be integrated, printed, and no wood used. UPDATE (FEB/15/2015): Modified big parts to print on 100x100 area. New STEP file includes all printable parts and STL files for each. https://www.youtube.com/watch?v=QpEauZWP_l4 Instructions: Eventually added here, just wanted to post files for experimentation. If anyone wants to modify this, a step file (.stp) is included with all parts, including wooden models of the first 1405 XL tower and a beefed up aluminum extruder and Ubis hotend. A parametric file (.x_t) is also available with the same models.