Fraser Ross' DIY Pen is a flatpack biro kit. A laser-cut sheet of plywood contains pop-out wooden donuts of various sizes, and these are slotted to fix onto two spars which form the twin scaffold ...

It's a pen that will be writing well into the apocalypse. YouTuber and DIY pensmith Jeremy Schmidt took to building this bolt-action pen because he was sick of dealing with pens that have caps ...

that moves the paper media forward and aft underneath the pen. The software chain used here is sort of uncommon compared to other inexpensive DIY CNC machines we see here on Hackaday.