Libro-Struder 2

thingiverse

Libro-Struder 2 is essentially an upgraded Libro-Struder with a built-in planetary gearbox, allowing you to use a standard Nema 17 motor without needing a stepping gearmotor. This experimental setup shows promise and offers a game-changing alternative. The Libro-Struder design relies on friction between a grooved inner gear and 11 outer gears that push filament down a tube toward the hot-end. This unique approach does not require a hobbed wheel, making it possible to assemble from mostly hardware store parts. The use of friction distributed over a large gear instead of pinching action between small rollers allows this mechanism to grip and push filament with high power without slipping. Print Settings Printer Brand: MakerBot Printer: MakerBot Replicator Rafts: Yes Supports: Yes Resolution: Low is fine Infill: 50 to 100% Notes: I recommend printing everything at 50% except for the object "Planetary Gears" which should be printed at 100% (solid plastic). Post-Printing Cleaning up the orbital gearing is a delicate process, as it's tricky to get it running smoothly. Be cautious not to break multiple sets of planetary gears like I have. Ensure that the pair of revolving planets are exactly opposite each other with respect to the center gear for optimal performance. You may also want to sand the teeth or use a jeweler's file to smooth out surfaces slightly, as there is natural taper to the gears that develops during printing. The box provides a nearly 60:1 advantage. Wearing in the Gearbox The planetary gearbox can be a bit rough when first assembled and might be too tight for smooth operation. I recommend applying grease to the internal gears' teeth and then turning the box with a cordless drill at high speed for 4-5 minutes. This will wear-in the teeth of all involved gears, making everything run more smoothly. Cleaning up the Filament Groove in the Big Gear Printing leaves behind some support material in the groove around the big gear. Clean out this groove and preferably sand it with a folded edge of sandpaper to ensure optimal performance. If the groove is not clean or not quite deep enough, it will put too much pressure on the filament and may cause the motor to stall. The small gears encircling the big gear are held by short spring arms in the Libro-Struder version 2, which might be a design limitation. Research and development continues!