trace guide
thingiverse
Diameter of a pen/pencil creates an offset to a sample. If the sample is away from the trace paper it affects the accuracy when trying to compensate by angling the pen/pencil. This can assist the curacy by removing the offset factor. Pen/Pencil diameter 11mm. 4.5mm hole for screw+nut to tighten pen holder opining
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With this file you will be able to print trace guide with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on trace guide.