¼-inch gravel (also called "crushed stone") is a popular choice for ... The next step is to pour the concrete into the molds and spread it with a trowel. Now is the time to get creative and ...

Into the top of these molds concrete is pumped continuously ... and five parts of crushed stone. The cement is so finely ground that it readily takes up the requisite quantity of water to make ...

[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 ...