Pen Plotter for Flyingbear P902

I designed this pen holder in order to attach it to the original carriage of the P902 printer. You'll need two M3 screws, attached from downsides (see photo). Aditionally, you can fix pen position with other M3 screws.

Note: pen diameter is 9 to 8 mm (it varies as you get closer to the spot). Pen used was a Faber Castell Multimark 421-S Permanent Marker.

UPDATE: I added a screw support, so you can 'inverse plot' PCBs