Ergonomic Pen - Takes a Standard Biro Inner

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Here is an easy-to-print ergonomic pen with holder that will take a standard biro insert. Once the insert has run out of ink, you can simply pull the pen apart and reuse it with another biro. I considered selling this design but ultimately decided against it because I realized how much help it could offer to people with dexterity issues, so instead I chose to give back to the community. Feedback on this initial version of the pen is greatly appreciated! Note: The biro insert does require trimming down to size; while I've provided a photo showing the dimensions I used, you may want to insert the biro into the pen's end and ensure it's fully seated before adding the grip. Measure the gap at the center to get an accurate length for your print. A few inserts didn't work due to ink being too far up the shaft, but most fit just fine.