These went into a clever 3D printed mold box, which was small enough to ... surface of each button by brushing on a thin layer of UV resin and curing it with a flashlight of the appropriate ...

Sadly, SLA-printed resin molds are notorious for causing exactly ... The print (sitting in the water bath) is exposed to external UV curing for 30 minutes, followed by a 6 hour soak in the water.