2. Using a scoop, place concrete in the cylinder molds. For 6 by 12 inch molds, place in three equal layers (1/3 volume per layer) and for 4 by 8 inch molds, place in two equal layers (1/2 volume ...

Into the top of these molds concrete is pumped continuously by compressed air, using two cylinders. The concrete itself acts as a pis ton, and the two cylinders are alternately filled and emptied.

That’s not the only use of the technique though, and perhaps one of the simplest is to use a 3D-printed mould for casting concrete. It’s what [ArtByAdrock] is doing in their latest video ...

[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 ...