Edit: Hi all, it seems like the general consensus is that this is a dangerous product. I really believed that I was making something helpful but that may not be the case. I have decided to take down the listing from Cults3D. Thank you for your feedback.
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Sorry for the unexpected negativity. I know that can feel discouraging. I like the design ingenuity, and I genuinely hope that you will continue to design and post about them. My comment as mod was because someone flagged this as violating rules... but those are more like strong guidelines. I don't see this as being a serious medical danger but I'm no expert.