I sell custom jewelry on Etsy and my Shopify website (lulimjewelry.com). I have a background in 3d printing and through that I realized that the sweet spot for 3d printed products is something that is small, high value, and custom. The jewelry industry fits this perfectly, and has already seen a large uptake in 3d printer adoption. I built a pipeline using fabric.js, flask, and blender that lets me take my customer's customizations (fingerprints, signatures, other engravings) and place them on a ring. I ultimately generate a STL file that I send over to my casting house in LA. They 3d print the STL in wax, and then cast that wax mould with precious metals using the traditional casting process. It's a fun side business as I get to tinker with new technologies (recently working on integrating a LLM into the ring design process). I have decent profits (enough to pay my mom and sister to help with customer support and shipping), so the workload I take on myself is relatively small.