I needed some push-up bars that would grip my carpet while exercising. I was doing push-ups normally but having my hands flat on the ground were hurting my wrists. Not going to lie I was worried about the strength of these things but I was able to do a push-up with both hands on one bar in the center with no discernible flexing, at 40% infill (I weigh about 250lbs). Note that at 40% infill they take a little while to print out but it prints easy without supports.

Update #1: I broke one of these while using them, it broke right down the middle, so I recommend increasing wall/shell count.

Update #2: Changed the rounds to chamfers to make printing without supports easier.

Creality

Ender 3

No

No

.28

40%

I listed the settings and brand of PLA that I used above. Increasing Shell/Wall count is a really good way to increase strength.

Please test these so that you don't hurt yourself when using them.