Simple Adjacent Line Tool
thingiverse
A gadget designed to align with an object's edge, accommodating tools like Sharpies or x-acto knives. Attach the tube to the slider using super glue and follow the step-by-step guide provided in the PDF for printing parts (I used PLA light infills). Assemble by inserting a #6 bolt into the thumbwheel and slider, then use a "magnet on a stick" tool, flashlight, and a #6 bolt to place nuts inside the tube. Secure 1/4-20 nyloc nuts in the base and screw in 1/4-20 socket bolts from the bottom until they are the same length as your material's edge. Note that this file is in inches.
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