Designing a Simple 3D Printed Mold Box for Mold Making

When it comes to mold making, it’s typically easy to make a simple, one-use mold box, pour the mold and discard after use.

However, when it comes to the scenario where multiple molds are required and there is a possibility of minimizing the mold materials used, it could be helpful to 3d model and 3d print a specific mold box.

3d Modelling the Mold Box

Using Rhino3D here, a circular mold box was created around the flower model to be molded. To make for easier demolding of the mold, the box was created as two semi-circles, with a tab extending from the sides. Spaced vertically on the side tabs are holes which will allow a series of nuts and bolts to fasten the two halves together.

One additional benefit of working with a 3d modelling approach here is that the volume of mold material can be very accurately calculated in the 3d modelling software. In the case above, we know its going to take around 300ml of mold material.

Assembling the Mold Box and Pouring the Mold

After the mold halves have been 3d printed, they are fastened with M3 nuts and bolts, and then positioned around the master object and hot glued to the base piece. As usual, we would then hot glue and tape around the setup to prevent any leaks.


And then we poured away, and waited for the mold to set.

Opening the Mold Halves

Once the mold material has set, the fasteners and tape were removed, before carefully taking apart the two 3d printed mold halves.

After a little bit of cleaning up of the flashing around around the mold, it was ready for resin casting of a duplicate:

Final Resin Casting from the Mold

And here;here’s the final resin-casted piece after it has been pulled from the mold. A near perfect copy of the original 3d print.

And now with our mold halves, it would be just as easy to replicate more copies of the exact mold so the can be run in parallel!


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