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A caliper for a pen... VERY IMPORTANT: pause the print before the pin insert hole (image 5) closes on top... then insert a small pin that perfectly fits the hole (oh my!!! watch out! the pin must not be sticking out of the hole! there's a danger that the nozzle will hit the pin and be damaged) so make sure the pin is fully in the hole... also you need 3mm diameter screws and 10mm length with nuts (tighten as much as possible) and a pen to put in the tube.