A modification based on my previous model.

https://makerworld.com/zh/models/201415

The original model used my daughter's rubber band as a spring part, which quickly lost its elasticity and broke after being stretched for a long time.

So I upgraded this 2.0 version to use a 1*6*25 stretch spring purchased from a certain online marketplace. Installing this spring is a bit tricky and requires using pliers to clamp it in. It's enough for my current use, but if needed, I'll see if there's a longer spring with matching ears to make an upgrade.

Materials needed:

1*6*25mm stretch spring (wire diameter * width * total length mm) (If you find it too tight, you can choose a wire diameter of 0.8 or 0.6, but I didn't test it due to limited budget. If you have any attempts, please share your feedback in the comments!)

Optional: EVA single-sided sponge tape for anti-slip. I used some I had left over from fixing my printer's air leak.