Gymnastics Rings
thingiverse
Printed on a MOARstruder. The strongest part I've ever made is this one. I use these every other day during lockdown, and they're holding up great. For straps, I'm relying on luggage lashing straps that are easy to find online: https://www.screwfix.com/p/master-lock-lashing-strap-5m-x-25mm/82529 Each one has been tested with a 150 kg load, and it barely budged.
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