Head measuring device
thingiverse
This device has two parallel surfaces that can be moved far enough apart to measure the width (or length) of your head. Note that the extra holes on the end pieces will hold a wade extruder. Instructions Print out two of each file. PLA will work best, since they are rather large. Drill out the hinge holes with a 1/8 inch or 3mm drill bit. Press in 1/8 inch or 3mm brass rods.
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