This is the testing jig i used to test my 3D printed zip ties. screwing the two halves in might take a couple of tries. When you cant screw anymore unscrew it then try again. The hole at the top where the zip tie went can hold at least 50 lbs with petg, i have not loaded it any higher  nor tested any other fillament. When you are testing somthing make sure to keep the jig close to the ground with padding like a pillow so you do not break it when it falls.

 I am new to 3d modeling, feedback is very appreciated so i can continue to improve my skills.