I belive there will be longevity problems with that. I like his designs, Just the long fingers with no support will be an issue. I have done a ton of prototyping on 3d printers and had a Magazine design that I had a couple of manufactures that wanted to license. In the end the magazines themselves that my kit woild modify became the issue so I scraped it.
I have been designing clips for my Hawk Helium sticks and have partially done with it. I was going to make more revisions to it tonight. I was getting things preped for this weekend and realized that elastic cord tied onto one step and then wrapped over the stacked steps works really well, will not break, and cannot fall off. I may finish it but may not use it.
I am not sure what material he is using. If it was nylon it may not be a problem. Even PLA can make a strong part. I have gotten it to make very good parts if you keep your print orientation, and wall thickness correct. Infill becomes less of an issue. I have some PETG here but have not printed with it much yet. I was looking at Nylon 66 for my magazine conversions but almost glad I did not take the leap. Big cost increase on machines, materials and accessories that are required for successful prints.
The problems with a design like that is the print orientation needs to be with the longer grain running the length of the fingers. The support Structure, depending on the filament can be a total pain to get off.
ETA: So the print orientation looks good for the strongest part. I see some things I would have changed to make it stronger.