CR-10 Mod - X Belt straightener - Motor Side

cults3d

In my opinion, the Cr-10 is plagued by a flawed project base regarding the x and y belts. All the machine's belts work with an inclination rather than in a horizontal and parallel fashion to the trolleys' movement planes. This inclination generates an error in the positioning of the X trolley, which cannot be completely fixed through e-step calibration due to its variable nature along the stroke. From 0 to 150 mm of travel, the error in Trolley positioning is between 0.00 and 0.24 mm. From 150 to 300 mm of travel, the error is between 0.24 and 0.28 mm (delta is 0.04 mm due to the belts being more horizontal in the second half of the stroke. Refer to the attached DWG for a clearer explanation. To avoid this issue, I designed a bracket with a double bearing wheel that allows the belt to work in a horizontal position, resulting in a significant reduction of machine travel error and rendering X e-step calibration nearly unnecessary. No further modifications are required for system installation on the machine; only 2 bearings (MR105 5x10x4mm or MF105ZZ) and an M5 screw for fixing the bearings are needed. Update of 13/04/2019 Major update to match tensioner measures on the other end of the X bridge: https://www.thingiverse.com/thing:3537042 I replaced the Bearings with a GT2 16T idler pulley as per the tensioner. A M3 screw, L=25 mm is also required. This will be my last revision for now. Update of 30/08/2019 Added an oversized fixing hole version due to user request. Holes are dia 6mm against the standard 5.5mm. I haven't tested this version myself, so use with caution. Best regards, Enjoy