[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 printed with flexible filaments before, you know you need an extruder that has a contained path. [Tom] borrowed a printer, but it didn’t have that kind of set up. The first step was to swap extruders with another printer.
Some scrap wood made a box for the positive model. [Tom] used a concrete-based mortar since he didn’t have real concrete ready for this test piece. However, his ultimate goal was to use concrete which he did when creating a final piece — an on-air sign — that he documented in several other videos.
The first attempt had some cracking and it looks like he may be pulled the mold too early. A second try with plaster gave much better results. [Tom] then experimented with painting the plaster to get a different look. In a follow-up video, he addresses some of the comments he got on the previous videos.