53 mm rubber band holder

Made a 53 mm rubber band holder that is made from lexan plastic. I would recommend putting 2 of them next to each other to make sure it doesn’t break. Also everything has smooth corners so the rubber bands won’t break and plenty of mounting holes for screws.
Here’s the link:
I’ll also start working on bigger sizes like a 62 mm
I haven’t tested it in real life so if someone makes it please comment if it works and what I need to change.

edit: picture
Screenshot (75)

You could also use a gear attached to the lexan sheet with some modifications to it


Can you post an image to see?

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Just click on the link for the sketch

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Have you tested this with rubber bands on it? I have a feeling they might bend despite having 2 layers to them. Also, what is the benefit of having this over the vex ones? I personally have not had edges of a sprocket cause a problem with the rubber bands breaking. The sides also look thinner and potentially make the rubber bands break more.

I already said I can’t make it because I don’t have a CNC machine or access to one

The main benefit of it is the ability to have them be larger than standard vex sprockets and sprockets also have smooth edges

Larger sizes makes sense, but I don’t see how the vex sprockets have less of a smooth edge than your design. If breaking rubber bands was really a concern on your robot, you could take a circular file and round the edges.

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Circular edges are hard to machine using a standard 3 axis cnc. You could do the top edge, but you’d need to hand file the bottom edge, or run two different cnc routes, which might lead to concentricity errors.

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The main purpose of smooth edges is to make sure rubber bands don’t snap also it’s a flat piece and only has smooth edges for the spokes.

Seems like a waste of lexan to me no offense


the rubber bands apply a lot of force to the sprockets, I wouldn’t trust lexan to not bend under the force of a bunch of bands. even the vex sprockets bend a little without standoffs bracing them.


I don’t think you’d have any bending problems if the sprocket was designed properly. Polycarbonate has all the strength necessary to support the bands. I do agree with Ethan tho that this may be a waste of lexan.

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Considering you don’t need very much lexan for the path going up the towers And also if you use a pooper design almost none. You should have plenty of lexan to do this. Unless you have some crazy way to use it all (since we don’t have to make long trays)

A lot of lexan will be used for wedges, not just the hood.

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You might be able to attach a gear to one sheet to increase the strength of it. Also you might need this to be able to even spin the lexan piece due to it being a circle hole not a square. Also there s should help with the total amount of lexan used because it’s a precious resource.

What material would you make this our of, it would be hard to cut this out of metal? Also idk if vex makes metal that big?

First line of the post?

Omg, I’m so sorry! Sometimes I suck at reading :joy:

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