Concentric Ring Fit Test

thingiverse

This test checks concentric ring fits and calibration with tight tolerances, designed for use with any material but tested specifically around PLA. The printer running this test must be capable of holding a tolerance of 0.1 mm or better. We highly recommend running our basic filament calibration test located at http://www.thingiverse.com/thing:1037301 before attempting to calibrate with these parts. The calibration and fit test consists of three rings that nest inside each other to evaluate different parameters. This setup tests the fit between two walls, the inner space within a single wall, and flushness on inner surfaces from one part to the next. Any miscalibration in your X or Y axis can lead to oval prints preventing parts from fitting together properly, making it crucial for this test that calibration be precise. Additionally, these parts will also test short span 4 mm radial bridges and indicate sagging by the inability of the middle ring to fit flush. When printed, minimal post processing may be needed: removal of a lip around the edges created in the first layer from initial contact with the print bed, or a vertical ridge from untuned retraction and head starting/ending points. For assembly, the three parts must fit together extremely closely at about 0.10 to 0.15 mm clearance, blending into one seamless print without needing touching of any other surface. Sequence images are included for printing sequence, assembly position, and the finished model as it appears complete in this orientation. Show your friends this assembled item and challenge them to guess how it was made without support prints! All three parts in a single STL file are CURA formatted and prepared specifically for direct print preparation from their setup on your slicer program. Print settings: rafts no, supports no, resolution at 0.10 mm, infill of 15% - 20%, notes include the recommendation that retraction is on, with the cooling fan active in layer two and after.