Tolerance test

pinshape

Note this is an import from: The formatting got messed up during the transfer. Updates are available on Thingiverse. Summary Designed as a test of 3D printing tolerances, inspired by my own experiences learning CAD (Onshape), slicer (Cura), and 3D printer (Monoprice Maker Select Plus) workflow - also influenced by a Maker's Muse episode: To do this exercise properly, update parameter(s) in the model to match your printer, which isn't how it should work. I plan to write about this in a weblog post at some point... In my latest iteration (versioned in Onshape), I was able to achieve a 0.2mm gap between parts using a parameter in the model, which is quite wrong. The parameter should be part of the printer profile given to the slicer. From the Document Description (in Onshape): The #overfill parameter adjusts the amount lines of plastic laid down by an additive 3D printer are a bit wider than where they're meant to land. For example, a 12mm circle measures about 12.1mm on my current printer, so I set #overfill to 0.1mm (for my printer). This #overfill number should be zero; the CAD model shouldn't have adjustments for the printer. The state of the art with 3D printers is not that advanced. In fact, it's similar to using on-paper printers in the 1980s and 90s. The clearance between each cylinder and the frame varies between 0.1mm and 0.7mm, in steps of #dxy_gap (which is set to 0.1mm). If you have an ultra-precise printer, try a smaller #dxy_gap value. On my printer I can free all but the last cylinder, and the gap between cylinder and frame is close to what's specified in the model. I suspect the #overfill value varies with temperature, layer height, filament, extrusion speed, etc. But ... have to start somewhere. How I Designed This Created in Onshape https://cad.onshape.com/document/...