How do you design and print hollow resin 3D models to save material and weight?

1 Choose a suitable model

The first step is to choose a 3D model that can benefit from hollowing. Not all models are suitable for this technique, as some might lose their structural integrity or aesthetic appeal. Generally, models that have a large volume, a smooth surface, and a simple shape are good candidates for hollowing. For example, a sphere, a vase, or a figurine. Avoid models that have thin walls, intricate details, or overhangs, as they might crack, warp, or fail to print.

2 Hollow your model with software

The second step is to use a 3D modeling software to create a hollow shell of your model. There are many software options available, such as Meshmixer, Blender, or ZBrush. The basic process is to select your model, apply a hollow function, and adjust the wall thickness and the infill density. You want to make sure that your walls are thick enough to support your model, but not too thick to waste resin. You also want to add some infill or support structures inside the hollow space to prevent your model from collapsing.

3 Add drainage holes to your model

The third step is to add drainage holes to your model to allow the excess resin to escape during and after printing. This is essential to prevent resin from curing inside the hollow space and causing pressure, deformation, or cracks. You can use the same software as before to create holes in strategic locations of your model. The size and number of holes depend on the size and shape of your model, but generally, you want to have at least two holes on opposite sides of your model. You also want to make sure that the holes are large enough to let the resin flow out, but not too large to affect the appearance of your model.

4 Print your model with resin 3D printer

The final step is to print your model with a resin 3D printer. You can use any type of resin that suits your needs, such as standard, flexible, or transparent resin. You also need to prepare your printer and your workspace according to the manufacturer's instructions. You need to orient your model in a way that minimizes the support structures and the exposure of the holes. You also need to set the appropriate printing parameters, such as layer height, exposure time, and lift speed. Once your print is done, you need to remove the supports, wash the model with alcohol, and cure it with UV light.

5 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?