Snowdecahedron impossible snowball maker

prusaprinters

<p>This is a mold for quickly making snowballs in the shape of a <a href="https://en.wikipedia.org/wiki/Rhombic_dodecahedron">rhombic dodecahedron</a>.</p> <p>This particular polyhedron has a couple of properties that make it really cool for snowballs:</p> <ul> <li>It's space-filling, meaning that you can stack these with no gaps in between</li> <li>All opposing sides are parallel, so you can easily grip the snowball using the mold itself for throwing, and also easily unmold it with a sliding motion parallel to one of the faces.</li> <li>Its 2D projection from a corner looks exactly like a cube projected from a corner, so photos of these look like impossible cubes from the right angles.</li> </ul> <p>I've included pre-made STLs in Small (good for quick snowballs to throw), Medium, and Large (good for sculptures), but you can copy and tweak the original design to your heart's content in <a href="https://cad.onshape.com/documents/0d7acb48842d89571aa144c5/w/96d1947cf92da8d0c7951f79/e/bdd405ba96c4a1ca3f6637ee?configuration=List_A8zu7MGtfN7qLj%3DLarge">OnShape</a>.</p> <h3>Print instructions</h3><p>The models are oriented so that the 45 degree bottom infill is parallel to one pair of sides of the bottom face for a more uniform look, so leave the rotation as is in your slicer.</p> <p>They print great with no supports.</p> <p>The pictures are of:</p> <ul> <li>The Small printed with 0.2mm layers in Prusament Neon Green PETG</li> <li>The Large printed with 0.3mm layers in Sunlu Orange PETG</li> </ul> <p>PETG seems to work well to easily release the snowball from the mold, but PLA should work just fine too.</p>