Micrometer Set Inch/Metric

thingiverse

Here are the inch and metric versions of a two-piece printable micrometer. The inch micrometer has a travel length of 2.5 inches, while the metric version has a travel length of 30 millimeters. An additional base piece is included for each one with a slightly longer anvil to file down one end and make it as accurate as possible. Both versions have been printed, with the inch version generally accurate within ±3 thousandths and the metric version really accurate within ±40 microns. It's highly recommended that you print the calibratable versions of the base piece. This design allows for sanding down the clamping point to get accurate measurements. If a standard base piece is used, measurements might be offset by about 15 thousandths. January 12, 2016: The rod piece was re-uploaded due to concern over its knurling being too deep and painful to turn. However, only slight changes were made and there's no need to redownload the part. January 15, 2016: Base_Inch_Calibrate part with an added 20 thousandths on the anvil was uploaded to compensate for measurement inconsistencies. It measures about 16 thousandths too short and users should sand or file down until it reads correctly. January 16, 2016: STL files were uploaded for a 30 millimeter metric version that needs a vertical print of 4.3 inches. The Base_Metric_Calibrate part is strongly suggested to achieve the best possible accuracy. Also check out Ultimaker's time lapse print at the given link. Print Settings: Rafts: Supports: Yes Resolution: Probably less than 0.2 millimeters Notes: Support generation should not be necessary for the rod piece, while it's necessary for the base part. Print settings may require tweaking for proper accuracy. Both parts were printed at the same time with 10% infill and a layer height of 0.15 millimeters. This required about 18 hours to complete with approximately 200 grams of filament used. Twisting once made might cause stiffness, but it should handle quite well after a few attempts. It's recommended to twist fairly hard for best performance.