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3D printed in white nylon plastic with a matte finish and slight grainy feel.
This is a flat, 3 millimeter thick piece with standard metric drill bit size holes, and can be used just as a decoration, or to measure detail, accuracy, and distortion (holes and flatness) in printed materials. Holes range in size from 1mm to 3mm in 0.1mm steps, and from 3mm to 10mm in both 0.1mm steps and 0.25mm steps.
The holes organized in "rows" and placed as efficiently as possible in order to limit material use. This results in a unique and beautiful shape. There are also small bumps on the edges to indicate the odd (x.25 and x.75) measurements. It is 3mm thick so that it can be printed with a variety of materials, including stainless steel.
A key is available here: http://www.thefrankes.com/wp/?p=2100
I should point out that I have not printed this object yet. I'll update this with results when I do.