PLA gymnastic rings

thingiverse

2019/oct update: 1 year later, I still rely on it regularly for exercise routines, often with 10 to 15kg extra and they have yet to show any signs of weakness. Exposed to the sun and rain over time. Gymnastic rings are pricey around here, so I decided to see if I could create a very strong one of my own inexpensively. To achieve this, I designed concentric rings inside the print. They ensure that the pieces have a significantly higher strength than they would with just regular infill, since they define the direction of the print with the shell of each ring. I've tested it so far by doing 12 pullups on 77kg (67kg + 10kg belt https://i.imgur.com/qB0OMKo.mp4 video of it) using one ring. Normally, you should use one ring for each arm, thus not exceeding maybe 50kg for each ring. I can't guarantee it will work with more weights but I plan to test. The shape is what I assumed would be a safer shape for plastic. However, I will create a new shape as this constricts my arm movements. It is so strong that I believe I can have more freedom. I included the gcode just so people can see how I printed it. I printed with supports just for that extra toughness and make sure the top layers don't become weak because they fell down a little, but I think I may have wasted filament. I printed with 4 layers of infill and 120% flow, again for extra toughness but I think it might also be wasteful and overkill. Anyway, I'm open to suggestions from any engineer out there. The objective is just to be able to do body weight exercises, nothing extreme, and be as affordable as possible. After all, if it's expensive it's better to buy the $20 wooden ring which has proven to work. Thanks for any advice.