Saint Flint - 11mm Drive Gear - PC4-M5 fittings

thingiverse

This is my updated version of the Saint Flint extruder. - The Mk10 drive gear measures 11mm, with either 36 or 40 teeth; it's irrelevant which one you choose. - I replaced the nut-trapped bowden tube connectors with M5 push fit connectors. Specifically, I used McMaster Carr part number 7880T368, priced at $1.44 per unit as of January 2019. You'll need four in total. The product can be found on their website at https://www.mcmaster.com/7880t368. I opted for these because they have a narrow profile and can fit closely side-by-side. - To simplify the printing process, I created hex-shaped filament path bores. - Instead of using standard threaded holes, I printed M5 threads to receive the bowden fitting. I prefer to use metal axles for my 608 bearings. For this purpose, I used M8 dowel pins; however, you can also get by with 5/16 dowel or tension pins from the hardware store fastener bins. I no longer utilize casino chips as indicators; instead, I simply draw lines on the bearings using a permanent marker and monitor those. Over time (months of use), the lines will wear off, but touching them up will restore their functionality. The indicator/lock tension ring should be snugly fitted. To achieve this, I recommend printing it at 103 to 105% scale for added adjustment and travel. If you encounter tight threads on your M5 bolt, you can file a couple of cutting teeth into the bolt to clean them up. I used four fittings in total; to guide the filament into the extruder, I employed a piece of bowden tubing as a makeshift guide.