Empty Spool Counting Mechanism

prusaprinters

<p>This mechanical counter prototype uses empty filament spools to make a huge counter with relatively little filament.</p><figure class="media"><oembed url="https://youtu.be/Dy3pF2HQYqo"></oembed></figure><p><a href="https://youtu.be/Dy3pF2HQYqo">https://youtu.be/Dy3pF2HQYqo</a></p><h3>&nbsp;</h3><h3>Printing</h3><p>All parts can be printed without supports.</p><p>Switch your filament color half way through the numbers print to get the digits display clearly.</p><p>&nbsp;</p><h3>Assembly</h3><p>Print one right and one core for each digit.</p><p>Print one less carryover gear that the number of digits you have.</p><p>Having an input wheel is optional. Regardless of whether the first wheel is a number or an input wheel, use the "Core for Input Wheel.stl", which include a starting cap.</p><p>When attaching numbers, use the included paper template to align them properly with the notch in the internal ring. Numbers can be added in ascending OR descending order, but 9 and 0 must line up precisely with the carryover notch.</p><p>&nbsp;</p><h3>Hardware</h3><p>Files are sized for Hatchbox spools, or any spools with the following dimensions</p><p>Spool hole diameter - 55mm<br>Spool width - 67mm wide<br>Spool interior width - 61mm</p><p>2.5mm smooth rod to hold the counter solidly and straight. You can try gluing the parts instead, but this is not recommended.</p><p>a scrap of 1.75mm flexible TPU filament, or similar elastic, to pull all of the parts together.</p><p>&nbsp;</p><h3>Can I sell copies of this?</h3><p>Yes! This project was shared under the [Creative Commons - Attribution](https://creativecommons.org/licenses/by/4.0/) license.</p><p>This license allows selling copies, but you must provide proper attribution, as detailed in the license itself.</p><p>Please note that any other projects linked here (remixes or related projects) may have a different license. Please respect those licenses.</p><p>[Click here for attribution examples](https://wiki.creativecommons.org/wiki/best_practices_for_attribution)</p><p>&nbsp;</p>