Asymmetrical Cube Puzzle

prusaprinters

<p>Another "two parts go together to form a cube" puzzle. Best if printed in two colors.</p> <h3>Print instructions</h3><p>Orient the model so that the face that looks like a letter "D" is face up, and it'll print without supports.&lt;/p&gt; I find 33mm the perfect size of these, so consider scaling up 1.66x in your slicer.</p> <p>If the fit is too tight or too free for your system, you have no recourse but to edit the .scad file. Find the ff= value in two places in screwcube() and modify it. The helix is displaced away from the Z axis by this value, so the gap is equal to twice the value.</p> <p>I was heavily inspired by RoCMP's design, but I somehow overlooked that there was a .scad file in their Thing, so I made my own from scratch. My design is asymmetrical, which I like because there's one more wrong way to assemble the Thing.</p> <p>The basic idea is: cut a cube into two identical parts, in this case by using a helix to divide 3-dimensional space into two half-spaces.</p> <p>One of the difficulties in producing this design is the way OpenSCAD treats polygons—nearby, near-collinear points are eliminated. It turns out that RoCMP works around this in a clever way, by scaling up the helix. But linear_extrude looks bad when it is extruding something with big flat faces. I didn't find this workaround, so I ended up reimplementing the moral equivalent of linear_extrude in OpenSCAD language itself which was certainly an adventure in its own right.</p>