Bridge and Overhang test

thingiverse

This is a test piece designed for assessing the limits of open space bridging and unsupported straight overhangs in 3D printing. The test evaluates the span and extension capabilities under identical conditions, removing potential variables from radiant heat generated by the bed. The provided files comprise a Cura-prepared part that is print-ready after scaling and orienting it, along with its source file designed for use within a modeling program. Scene units are in inches while object units measure millimeters. Through experimentation, I found that at 15 mm bridges exhibit virtually no sagging, with variations less than 0.1mm. On the other hand, the 4mm overhang proved to be flat by the third layer with a maximum total thickness deviation of 0.3mm. Further analysis revealed that a 5 mm overhang remained flat at the fourth layer, indicating it as a practical limit for horizontal straight overhangs in this scenario. Print Settings: Rafts: No Supports: No Resolution: 0.1mm Infill: 25% Notes: To ensure successful testing of these bridging and overhanging conditions, part cooling fans along with directed duct work are necessary components. Print speed reached up to 40 mm/s with the PLA at 200C, the bed maintained a steady temperature of 50C, and the part cooling fan operated at maximum speed (100%).