Concrete Cinder Block mold 1/20

thingiverse

I make a concrete block mold that is 1/20 scale. I use 10 shore RTV2 silicone and it turns out very well. I also write down the concrete mix ratios below. If you want to make changes, I'll add a SketchUp file too. You can visit my profile for other building material molds. Cement 6* Marble dust 3* Grout (tile fill) 1* Water 4* Important: Use mold release spray before casting with RTV2. Apply vibration after casting to prevent air bubbles from forming. Don't remove the block from the mold for at least 24 hours, and keep it moist by spraying water often. Water is crucial - don't let it dry out for a few days. It can take up to a week for the block to harden completely.