Toothpick/match C60 fullerene/truncated icosahedron connectors

prusaprinters

<p>Paper drinking straw C60 connector can be found here:<br><a href="https://www.printables.com/model/204151-paper-drinking-straw-dodecahedronc20truncated-icos">https://www.printables.com/model/204151-paper-drinking-straw-dodecahedronc20truncated-icos</a></p><p>@<a href="https://www.printables.com/social/257210-jmckeand"><strong>jmckeand</strong></a><strong> </strong>did provide many toothpick connectors here …<br><a href="https://www.printables.com/model/179841-polyhedron-connectors">https://www.printables.com/model/179841-polyhedron-connectors</a><br><br>… but C60 connector for joining a pentagon with two hexagon faces is missing. Also he used “hull()” to create a nice looking connector. Here I created C60 connector with nearly minimal amount of PLA.</p><p>After exporting OpenSCAD file as STL, importing into PrusaSlicer, requesting 60 copies and clicking on “arrange” button, only 49 connectors ended up in printable area as it looks. In fact PrusaSlicer has a small bug wrt brim, the front 7 connectors do lie a bit outside of print area of Prusa MINI+. I moved the 7 connectors a bit more up, and added the 11 connectors placed outside into available space on print area. Attached .gcode file just prints without issues because of the brims. After removing brim, the leg of connector with brim can still be identified. That is good for constructing C60, as that leg is for toothpick between two hexagons (the faces next to the other two legs is a pentagon and a hexagon).</p><p>Removing 60× brim is not that fun, but constructing C60 afterwards rewards for it.</p><p>Similar ratio of C60 height (29cm) to toothpick length (63mm) as C60 height (92cm) to paper drinking straw length (197mm) — 4.60 vs. 4.67; no glue, just sticking together.</p><p><a href="https://forum.prusa3d.com/forum/english-forum-awesome-prints-hall-of-fame/toothpick-polyhedra-fullerenes/#post-607341">https://forum.prusa3d.com/forum/english-forum-awesome-prints-hall-of-fame/toothpick-polyhedra-fullerenes/#post-607341</a></p><p>After going bigger than toothpick with paper drinking straw, now I got smaller with using matches. More work, had to light 90 matches and then immediately blow out, finally remove what was left on wood by turning in paper.</p><p>Match has side-length 2.15mm, so should fit into 1.5mm radius cylinder hole. I did choose 1.3mm in OpenSCAD file, and reduced length from 10mm to 8mm. Reduced diameter needs pressure to fit match into connector, but on the other hand makes connections very firm.</p><p>I used white PETG this time, and that produced more work (compared to PLA), first to remove 60 connectors from heatbed, and then &nbsp;remove brim from each connector. I added photo of C60 with white PETG connectors and 90 matches, and PETG Prusa MINI+ gcode.</p><p><a href="https://forum.prusa3d.com/forum/english-forum-awesome-prints-hall-of-fame/toothpick-polyhedra-fullerenes/#post-608225">https://forum.prusa3d.com/forum/english-forum-awesome-prints-hall-of-fame/toothpick-polyhedra-fullerenes/#post-608225</a></p>