About this 3D model

The basic plastic printerbot frequently produces bands on the sides of the prints which match the z-threaded rod pitch. This is most obvious on prints using .2mm or thinner slices. In order to find the source of the problem I made custom parts to lock the bearings and rods in place. I also made an external bracing. The source of the banding appears to be a rocking in the z-motors. This causes uneven z-lift which in turn causes some layers to be squashed and buldge on the sides. This is easiely fixed with a few wedges but the other parts may be of some use for people wanting a more rigid bot or to re-purpose for something else. Also the z-motors are .5mm too far out on my bot. This is an error in the orginal CAD files. I have a corrected but untest version here. http://www.thingiverse.com/thing:26542 I will be publishing more modified parts when I find time. I have done the CAD for a modified base with extra motor support but this is overkill for most people. http://www.thingiverse.com/thing:28557