QU-BD Revolution XL Z-Stop Adjuster

cults3d

This is a revised setup for calibrating and adjusting the Z-stop on a QU-BD RXL 3-D printer. \n\nUpdate: 01/03/14: Two new STL's for the bottom component have been added, shifting the adjustment screw 1mm closer to the bed, as some users reported alignment issues with their printers. \n\nUpdate: 10/27/13: The STL files have been replaced with lower-resolution versions, oriented flat in the X/Y plane for easier slicing and printing. \n\nI discovered that my RXL printer's homing repeatability was very poor, resulting in a variability of at least 0.5mm, which I attributed partly to the noticeable flex in the frame corner holding the bed. Furthermore, the tight positioning of the Z end-stop switch behind the front right frame pillar made it difficult to adjust the z=0 position. \n\nTo correct this, I decided to move the z-stop over by the Z-axis, where the platform is most stable, and use an easily adjustable screw to trigger it. To keep the assembly as rigid and firmly fixed as possible, a built-in 'banana block' clamp was added (inspired by Jeremie Francois' design for sliding blocks that I am using on my Ultimaker). \n\nWith this setup in place, perfect z-homing occurs every time, compared to the 20% or less first-layer success rate I initially saw.