Pen/Sharpie holder for 500W CNC Spindle

thingiverse

I needed a pen holder for my MPCNC without disassembling the spindle. That pen holder fits snugly onto the spindle collet shaft and accepts pens or sharpies up to 13mm. As the sharpie is fixed at an angle, it's possible to align its tip with the axis of the spindle. It features a small stop, allowing for repeatable setups. To prevent spindle rotation, I created a simple stop that fits onto the fan on top and can be secured with an M5 screw, keeping the sharpie from rotating. Since then, I've upgraded the stop to make it more robust. Use this setup only if your surface is extremely even since it lacks flexibility to compensate for any irregularities. Let me know if you have any feedback!