This mod adds a third linear rod in both the Y and Z axes. The third rod greatly reduces the amount of twisting that can occur, especially with an extended Y mod installed. This mod is based off of Jon Lawrence’s 300mm no sag mod. It also includes modifications to a couple of other’s works which I will list in the remixed from area. UPDATE (12/13/2014): After printing out the model for the “TRI_ROD_MOD_TOP1_XL”, I found out it didn’t fit because the models for the XL wood parts were not correct. I have measured my actual wooden XL parts and have redesigned this part to now fit correctly. I also beefed it up a bit. UPDATE(2/13/2015): I uploaded a new step file with just the parts for the non XL version. I also have separate step files for the 2 biggest parts. I verified that these can be imported with FreeCad. P.S. I will try and work out a basic hardware list sometime soon. P.P.S. I am also working on another version of this mod that will be integrated into the “JONbot”. Nothing from this version will be compatible. The XL tower parts will also be integrated and are printed, no wood parts will be used at all. UPDATE (FEB/15/2015): I have modified all of the big parts to be printable on a 100 x 100 print area. There is a new STEP file with all of the 100×100 printable parts as well as STL files of each. https://www.youtube.com/watch?v=QpEauZWP_l4

Source: Printrbot Simple 1405 “TRI ROD MOD” with or without XL tower upgrade (first 1405 XL tower) by threefer