The Shy Rockabilly Extruder is a remix of the B'Struder universal Bowden extruder. The basic design ideas are the same but the remix allows for parametric modification of model details such as filament thickness and bearing details. The extruder arm has a lower profile and it requires only two bearings instead of original three.
Like the original B'Struder, the Shy Rockabilly Extruder uses 623 bearings (only two needed). M3 nuts and screws are used for putting everything together. This variant is made for a Mk8 drive gear and a M5 threaded tube connector. Add a 10mm diameter spring to tension the arm.
I have printed different design iterations from both ABS and PLA and both work fine with moderate infill. The extruder face can be printed as is. The arm can be printed upside down without supports or in the original orientation with supports enabled. Without supports, the bearing enclosures come out a bit messy but the arm is still usable.
The design works flawlessly with my large kossel-style delta printer.
The thing is designed using Autodesk Fusion 360. The original design files are available for modification here:
| Shy_Rockabilly_Arm_1.75mm.stl | 163.2KB | |
| Shy_Rockabilly_Arm_3mm.stl | 169.4KB | |
| Shy_Rockabilly_Face.stl | 148.3KB |
