Crayon Recycling Kit

prusaprinters

<p>You might have jar of old broken crayons. Or maybe your crayon just broke in half. Use this kit to cast a new one.&nbsp;</p><blockquote><p>You can either cast silicone mold, or print a plastic one. However i was unable to successfully cast crayon in printed mold (even though it should be possible). Therefore i recommend you to cast a silicone mold.</p></blockquote><h3>Casting silicone mold</h3><ol><li>Print one <i>Crayon Mold Base</i></li><li>Print one <i>Crayon Mold Side</i></li><li>Print six pieces of <i>Crayon Mold Pin</i></li><li>Assemble <i>Crayon Mold Base </i>and<i> Crayon Mold Side</i></li><li>Prepare two part silicone, i used around 30 g of mixture</li><li>Optionally degass silicone mixture</li><li>Pour silicone into assembled mold and let it cure</li><li>Carefully remove cured silicon</li><li>Repeat this process to create two parts of silicone mold</li><li>Assemble mold&nbsp;<ol><li>Insert six <i>Crayon Mold Pins </i>into one mold half</li><li>Assemble two silicone parts together</li><li>use rubber bands or tape to fix the mold</li></ol></li><li>Proceed to section <strong>Casting crayons</strong> for next steps&nbsp;</li></ol><h3>Using printed mold</h3><p>Using printed mold is simpler procedure but it can be tricky to get the cast crayon out. I was unable to do so.</p><ol><li>Print two halves of <i>Crayon Mold</i></li><li>Print six pieces of<i> Crayon Mold Pin</i></li><li>Post processing and fitting<ul><li>top face of each mold half should lay flat on each other, you might need to sand them</li><li>pins should slide to mold but should not wobble (transition fit), you might need to sand the pins a little</li></ul></li><li>Assemble mold (secure both halves with rubber bands or tape)</li><li>Proceed to section <strong>Casting crayons</strong> for next steps</li></ol><h3>Casting crayons</h3><p>Once you have mold created you can start with casting.</p><ol><li>Get small container that can be heated and allows you to easily pour molten wax<ul><li>you can either heat it water bath, in that case you can just cut small PET bottle</li><li>or you can heat it on stove, in that case you can use tin cup or small pot</li></ul></li><li>Put crayon bits into container</li><li>Melt the wax in container</li><li>Carefully pour molten wax into mold and let it cool down</li><li>Carefully unmold your new crayon</li></ol><h4>Finishing and notes</h4><ul><li>You can print provided labels (or create your own) and use wood/paper glue to secure it on your new crayons</li><li>Melting and pouring wax is not particularly dangerous, but you should still be careful not to get burned (and not to spill colored wax everywhere)</li><li>You should recycle any (recyclable) trash that is created in the process</li><li>Finished crayons are 83 mm long and have 12&nbsp;mm in diameter</li><li>The wax will shrink as it cools down - you should&nbsp;</li></ul><blockquote><p>If you like casting check out my <a href="https://www.printables.com/model/237177-silicone-soap-mold">Silicone Soap Mold</a></p></blockquote>