February's challenge is to turn a sphere. I've had some ideas swirling around in my head about resin and dowels, and I decided to give it a shot. The mold came together beautifully, and my estimate ...

No surprise, the resin molds didn’t last nearly as long as a proper mold. After 70 shots, the mold was worn beyond what you’d want to use.

Here’s how he’s doing it. Before you pour epoxy into a mold, you’ll need to figure out how you’re going to attach your ways, linear rails, and ball screws.