BLV mgn cube Helmet Extruder

thingiverse

This is a complete direct drive print head assembly designed specifically for the BLV mgn cube by Ben Levi. It draws inspiration from Ben's original Twin Blower but aims to improve upon its design in several key areas. My initial goal was to shorten the filament path from the extrusion gears to the nozzle, but I soon realized that this would not be possible if I wanted to keep the extruder stepper motor on top of the rail. To resolve this issue, I created an entirely new extruder design that flips the extruder gears below the motor gear, rather than above it as in the original BMG. This simple change reduces the distance between the extrusion gears and nozzle opening from approximately 118 mm down to a much shorter 79 mm. Whether or not this reduction in filament path length has any significant impact is up for debate, but I was able to lower my pressure advance from 0.09 to 0.06 for PETG after implementing this design change. Features: - I'm biased, but I think it looks really great! - It mounts both V6 and Mosquito (or clones of them) hotends - Optimized cooling fan ducts - I've spent a lot of time simulating and actually testing the design of the ducts in real-world conditions - Well thought-out cable management - cables are routed hidden away up to a cable guide that can be angled to your preference. If you don't like this solution, you can create your own and attach it to the front plate. - Improved belt paths to keep the belts parallel to the X axis - Native support for BLtouch What you need: - Some PETG filament of your choice (or whatever's currently popular) - A BMG extruder to pick apart or purchase spare parts from Bondtech, Triangle Lab, or Mellow - Two 4010 blower fans for part cooling - A 4010 axial fan for hotend cooling - A PC4-01 pneumatic fitting for holding the end of a reverse Bowden tube. If you don't want to use reverse Bowden, you can leave this out. - A piece of 3 mm nylon filament for the cable guide - A textile sleeve (or similar) for the cable guide - A BLtouch or clone - no other Z probe is currently supported - A bunch of M3 screws and hex nuts - The top and bottom plates from the original BLV mgn cube project. These are the same. Use whatever print settings you feel is warranted, and also print with supports according to your own judgment but here are a few guidelines: - It's a pain to get supports out of deep horizontal holes, so avoid them where possible. - Don't put support inside the filament path; it will be impossible to remove and is designed to bridge without. - DO put support right where the filament path crosses the gears; there's a bit of overhang there. - Don't put support in the fan ducts; it will be impossible to get out and is designed to bridge. I suggest you check out the online CAD viewer as a reference for how to assemble: https://a360.co/3cWstBm I included some photos for reference of cable management. For Z probe offsets, use X36.47 Y-4. Finally, I hope you enjoy it, give me feedback, and remix it with the included STEP files.