Kurt acquires a 3D printer and begins making various consumer products based on designs found online, without considering product safety. Elly designs a teething ring that becomes popular. However, Kurt speeds up printing and doesn't cure the lawn darts properly, potentially endangering users. Additionally, a replacement blender blade Kurt prints contains plastic shards, showing issues can arise from untested designs and materials. The story highlights that 3D printing allows anyone to make and distribute products without safety oversight, using unknown designs and materials, which could have dangerous consequences for consumers.