analogue wrist calculator: a circular slide rule
Description
This is a slide rule that may be worn as a bracelet. It has reasonably threeish values of three. That is significant because at least two of the scales circulating on thingiverse have such small values for three that they give 8.9 as the value of three times three. The scales on this slide rule are more accurate giving more of a more nineish nine as the value of three times three. The openscad files in the zip will let you change size will maintaining the gap for sliding. Also, there is a module "writeMod(insertText)" that allows for labeling. The openscad files are in a zip because the Thingiverse configurator had trouble with it. Also, there are a lot of constants. The most relevant constants appear at the top of the file. And the file is commented so it should be possible to customize even if it is your first time with openscad. The files take some time to render, so grab a coffee or two while you wait. Printing: Set perimeters to nozzle size, especially when printing with an outer diameter around 200 times the nozzle size. That is 80 mm for a .4 mm nozzle. A ring could be made with a printer tuned to a .1 mm nozzle and a person with exceptionally keen eyesight. I printed a baby bracelet at 40 mm with a .2 mm nozzle and the detail was the same as an 80mm bracelet printed with a .4 mm nozzle. Print with tick marks in the direction of added material (that is up on most filament printers). PLA or other biodegradable material is recommended unless all users can be relied on to perfectly recycle their slide rule at its end of use. The D scale should snap over the C scale. If it does not, print the cut version of the D scale.The cut D scale has an opening near the one mark. After a year it is not recommended to detach the D ring as PLA becomes brittle over time. While biodegradable, PLA can take a long time to decompose. Reuse, recycle or dispose responsibly.
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