There are countless examples on the internet of people adding laser engraver modules and pens to their 3d Printers. They're designed to be modified, they use an

There are countless examples on the internet of people adding laser engraver modules and pens to their 3d Printers. They're designed to be modified, they use an open source control language utilized by industry, unlike that pen device using a proprietary language. The $150 laser engravers from Eleksmaker for example have an unused servo pinout on their control boards specifically for adding an accessory like an actuator for a pen. It would be trivially simple to swap out the laser module, which is held in by thumb screws, and replace it with a pen.