I wanted to try making a concrete clock with my modules.
I started by designing an interior mold printed in 3d
The outside of the mold is made of wood panel.
I poured the concrete in two stages.
Everything seemed to be going well...
But removing the cylindrical parts was complicated. I had to bump them out. Result: big cracks!
I'm thinking of redesigning the cylinders to give them a conical shape. Maybe also add more fiber to the concrete...