LEGO Technic compatible Stabilo 88 fineliner holder pen holder

thingiverse

#LEGO Stabilo 88 series fineliner pen holder I wanted to use a fineliner felt pen to draw or plot things with a LEGO Spike Prime robot. While it is not hard to brick-build something to hold a pen, what I found really difficult was to get the pen tip centered on-grid. This became an issue once I tried to demonstrate to students, that a tank-steering robot spins around the point right between the wheels - I needed a way to mount a pen directly and exactly centered on a stud/technic hole. So, here is a design that will hold a Stabilo 88 sized pen (7.8mm hexagon) centered on a stud. There are three objects: ##1. LEGO Stabilo Holder This is two-stud high block that should be placed with 3 or 4 studs gap above plot surface. One block is sufficient to hold a pen, but the hold isn't as precise, as with the split variant. ##2. LEGO Stabilo Holder Split This is one-stud high holder, of which you should use two, a few bricks apart (4-5 stud vertical spacing is enough). The lower holder should be placed with 3 or 4 studs gap above plot surface. ##3. LEGO Stabilo Holder Pickup If you need a pen lifting mechanism (see videos) you need to replace the lower holder from the split arrangement with this. This will allow the pen to touch paper if the gap below the unit mounting block is 3 stud high and will lift the pen off-paper once the gap is 4 stud high. The plotting surface can vary in height by up to about 0.4 stud.