[Thomas Sanladerer] wanted to create some molds using 3D printing for concrete and plaster. He used a delta printer with flexible filament and documented his process in the video below. If you’ve ...

Q: The concrete steps at my house are moldy and kind of green on the risers, except where I applied a concrete sealer. I did it badly, so you can see areas that look like drips. How can I safely clean ...

Q: I want to wash black mold from a concrete wall next to plants. Can I use dish detergent and a hard bristle brush instead of a power washer? The water will be running to the plants, so what kind of ...