Bulldog Extruder Filament Guide

thingiverse

This filament guide holds the filament firmly in place between two sliding guide pieces: one over the hobbed gear and one under the ball bearing. The bearing that comes with the Bulldog Extruder is replaced by a smaller bearing, which measures 696-RS 6mm x 15mm x 5mm Ball Bearing. Assembly Steps: 1 - Insert the smaller guide piece into the bearing cartridge (flat side up). 2 - Place the bearing cartridge over the extruder's hobbed gear. 3 - Use a long hex driver to push the hobbed gear against the filament guide and tighten it securely. 4 - Place the ball bearing into the larger guide piece and insert it into the bearing cartridge. 5 - Tighten the bearing in place, but avoid over-tightening. The Bulldog Extruder can be converted into a direct drive extruder by adding a heat sink and a fan. This combination dissipates heat as effectively or even better than the Titan Aero at a significantly lower price. Here are the steps: 1 - Counter-sink the two existing screw holes in the cover plate. 2 - Drill additional holes in the cover plate for attaching the heat sink and fan. 3 - Attach the extruder body to the motor using only two screws on the filament entry side. 4 - Attach the cover plate to the extruder body with flat head screws. 5 - Attach the heat sink and fan to the extruder body with two long screws on the filament exit side. 6 - Apply thermal grease between the extruder body, the cover plate, and the heat sink for better thermal conductivity. Printing Tips: - Mirror the design in your slicer for a left-handed extruder. - Use infill of at least 50%. - Set walls to at least three lines. - Level the print bed properly to prevent the first layer from getting squished. - Ensure all other parameters are also calibrated.