Parametric Scribing Pen Holder Ring
Description
holds pen perpendicular to a surface and allows scribing an edge of a thing at a given distance. default sized to fit Expo Vis-a-Vis fine point wet erase marker. How to size for your pen/marker: pen_tip_h how long the business end of the marker is before reaching the body of the pen pen_collar_h the length of the tapered part of the pen body nearest the tip you want to interface with. pen_collar_d1 the diameter of the pen at the bottom (narrowest) part of the tapered body end. pen_collar_d2 the diameter of the pen at the top (widest) part of the tapered body end pen_d the diameter of the pen at the widest point scribe_r the distance from the edge you want to scribe
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