Mini Infinity Cube (13.3mm cube segments and smaller possible)

prusaprinters

<p>I printed the 16mm version of Waveman's sturdy infinity cube (thanks for sharing!) <a href="https://www.printables.com/model/88525-sturdy-infinity-cube">https://www.printables.com/model/88525-sturdy-infinity-cube&nbsp;</a></p><p>but I discovered that it was fused just enough that I needed pliers to free the blocks (and broke a couple links in the process) so I decided to revisit the OpenSCAD code to loosen the tolerances. &nbsp;I also decided to scale the resulting model down even further so it prints faster, especially at 0.28 layer height (what I printed at)</p><p>My effort to scale down and loosen the tolerance was a success. &nbsp;I have printed two of these Mini Infinity Cubes at 100% scale and two at 89% scale, both at 0.28 layer height with 100% infill successfully. &nbsp;At 100% scale, each of the 8 blocks are 13.3mm cubes. &nbsp;I found that it is small enough and loose enough to operate with one hand.</p><p>Scaling the stl to 89% makes the individual cubes 11.837mm and trims ~25% off the print time. &nbsp;I can recommend scaling to 89% if you want a smaller infinity cube that is just a little tighter and prints faster with even less support (at least for me). &nbsp;Both 100% and 89% scaling seems to work well and reliably. &nbsp;My kid loves them both and wants to make more for friends.</p><p>I used eSun light blue PLA+. &nbsp;I printed with support. &nbsp;A minor amount of support is used between the link and the cube and is relatively easy to break free and remove the support from the links after flipping the blocks around. &nbsp;A little more support is needed at 100% scale than 89% scale. &nbsp;I just used the corner of the bed scraper to clean up one layer of support on the links at 100% scale. &nbsp;Breaking the links free from the support was not a problem with some even thumb pressure off the print bed. &nbsp;Virtually no support cleanup was needed at 89% scale.</p><p>--</p><p>FYI, I first tried scaling this stl file down to 70% of its size (resulting in 9.31mm cubes) and printed that at 0.28 layer height. &nbsp;This was a partial failure for me. &nbsp;While most joints did work, I had a couple broken links after initially moving the links off the print bed (a few joints broke when trying to break free with the help of pliers). &nbsp;If you do scale it down, I don't advise scaling by too much, at least for a standard FDM printer with a 0.4mm nozzle. &nbsp;I found that the links and link pins were weaker than I would like at 70% scale and the links that did not break were stiffer than at 100% or 89% scaling. &nbsp;70% has a chance of working but if you wanted to print smaller, I'd consider scaling to 89% scaling as that worked great and is stronger than 70% and didn't require any pliers to break the links free (at least for me).</p><p>I chose to print at 89% scale at 0.28 layer height specifically because I noticed that at 90% scaling, Cura showed a layer of support that was mostly not present at 89% scale and the actual print at 89% scale worked flawlessly with virtually no support cleanup required.</p><p>Print time was roughly 1.5hrs at 89% scale, 2 hours at 100% scale using 100% infill and 0.28 layer height at 80mm/s. &nbsp;The pictures are of the larger infinity cube with 13.3mm cube segments.</p><p>Enjoy!</p>