I use 16 stone pillars in a box formation and stack it 2 high with a large bear trap works decently well and is pretty cheap. You could only it use only 8 pillars and a large bear trap to make it cheaper. All you have to do is setup the box and leave it open put bear trap in the middle and have it chase you into the trap and simply slip through the gap in between the pillars and when it’s stuck in the trap go behind it and use the last 2-1 pillars I have and seal it in. Works great I’ve used this trap for other tames such as wooly rhinos and a yutyranus probably works for rex’s too.

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