Printrbot anti-wobble.

thingiverse

To resolve the issue of banding on prints, custom parts were created to lock bearings and rods in place while adding external bracing. The source was found to be rocking z-motors causing uneven z-lift, resulting in squashed layers with bulging sides. Fixes include wedges, but modified parts like a base with extra motor support are available for those seeking greater rigidity. A corrected CAD file can be found at thingiverse.com/thing:26542, while an overkill base modification is at thingiverse.com/thing:28557. Wedges and a custom frame may be printed or made from other materials if desired. The frame fits specific tray corners or could be modified for plywood use. Z-rods have tapered joiners allowing adjustments without disassembly, but sanding may be needed to loosen them. Full height and width may require top joiner rod length increase and A-frame spool holder removal.