B-Struder - E3D Hobb-goblin edition

So I came across the original B-Struder while searching for extruders. I like the design, but as I had some E3D Hobb-…
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updated August 25, 2022

Description

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So I came across the original B-Struder while searching for extruders. I like the design, but as I had some E3D Hobb-goblin drive gears, decided to remix the design to support those.

Changes to original:

  • basically the arm was re-designed from scratch in OpenSCAD to match Hobb-goblin gear
  • the arm's filament path needs to be drilled open. See post-printing
  • other parts (MR105zz_support, lock lever) extended in height as needed
  • extended and added some bolt holes to the motor mount as I needed those for my own use (4mm hole, 29mm distance)
  • lock lever has other 'arm' which should help operating it. I actually cannot use it due to space constraints (was a good idea but didn't check clearances...)
  • added a spacer which can be used if one has MR105zz_support and lock lever from original thing
  • added new spring cap for 8mm spring

Most of the original instructions and part list apply. You will need a bit longer than 25mm M3 bolts for this. Also I'm not using the printed washers but those should fit fine.

Source code: https://github.com/spegelius/3DModels/blob/master/B-struder_remix/b-struder_remix.scad

Print Settings

Printer:

FrankedCube

Rafts:

No

Supports:

Yes

Resolution:

0.2mm

Infill:

50%

Filament:

Esun? ABS

Any


Notes:

For the arm. 4perimeters and 50% infill. I used supports, but should work without those too if your printer and material like bridging.

The motor mount should be solid. Other parts 2-3 perimeters, 20+% infill.

Post-Printing

After printing the arm, you need to drill out the filament path with 2mm drill bit. This is by design as I tried to maximize continuous perimeters around the filament path and drive gear hole.

When printing, be careful to print straight! There's a small hole that should guide the drill bit, but the drill bit can still wander if not careful.

The M6 push fittings should be possible to just screw them in. I haven't printed the arm without supports so don't know how well the threads work if printed without supports

Category: 3D Printer Extruders

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Model origin

The author marked this model as their own original creation. Imported from Thingiverse.

License