I've used these rubbers: https://amzn.to/4dnZbLg

But these should also work: https://amzn.to/4ba8gFW

You can also use the ones with 4 rubbers and just leave one empty hole in each side (I suggest the middle one).

 

I printed it with PETG, but after printing and testing, most probably PLA would also work. Let me know in the comments/makes.

Print HORIZONTALLY to increase strength/resistance.

- Layer height: 0.15
- Line width:
  - Default: 150%
  - First layer: 100%
  - Outer wall: 100%
  - Inner wall: 0
  - Top surface: 100%
  - Support: 100%
- Wall loops: 5
- Alternate extra wall: Yes
- Top shell layers: 5
- Top shell thickness: 1
- Bottom shell layers: 5
- Bottom shell thickness: 1
- Infill density: 50%
- Infill pattern: Cubic
- Support: Yes
- Support type: Tree
- Support angle 30

Strong Slingshot for 6 Rubbers

TirachinasV3.stl

Benchy Holder for Multiboard

Benchy Holder.stl

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Strong Slingshot for 6 Rubbers

Benchy Holder for Multiboard