"We use permanent markers on a daily basis at the shop," writes mechanical engineer Daniel Bauen, who runs Georgia-based industrial design and manufacturing studio Soul Built. Bauen ticks off the pain points of standard markers: "I don't enjoy having to remove the cap every time I use it. The existing plastic retractable markers have many issues, the worst being that they often extend while clipped onto (they are also terrible at staying clipped on) a pocket, and then will leak and stain...


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