Flying Extruder for Kossel w/stock motor

cults3d

This is a bold attempt at creating a flying extruder using standard motor components.\nI'm utilizing a gear-reduced dual-drive (Bondtech BMG clone) extruder, which makes the stock motor completely unnecessary for this application. If you're working with a pancake motor that's 23mm or smaller in diameter, you might be more interested in my other flying extruder design.\n\nOriginally, I designed this setup so that a simple 3mm cap-screw could be used to attach surgical tubing (secured with a zip tie) directly to the carriages. However, after discovering these mini-bungie cords at Home Depot, I decided to incorporate them into my design instead. They're the perfect length and ended up being an excellent choice.\nThe placement of the holes for the bungies was carefully calculated to distribute the weight evenly among the three carriages. This setup does result in a slightly loose rear bungie (if you use the mini-bungie cords mentioned earlier), so I added a knot to shorten it up (this becomes obvious if you take a closer look at the design of those particular bungies).\nThe row of holes along the diagonal top beam was intentionally placed there for flexibility with a counterweight. While researching, I came across a professional-quality retractable key-ring made by KEY-BAK called the "SUPER48" that has plenty of pull and is designed for huge keyrings. Since I'm using a heavy stock extruder, I opted for the 13oz model. As it turns out, the stock motors hold this setup even when unpowered, which was an unexpected benefit.\n\nAfter installing this flying extruder, I reduced my retraction settings to just 2mm. By switching the bowden tube to a 1.9mm ID one, I was able to lower my retractions all the way down to 0.4mm!\nThe cube in the pictures was printed using 3D Solutech See Through Blue PETG. The two key factors that contributed to its successful printing were this flying extruder setup and my corner reinforcements.