About this 3D model

I made a remix of this device (increased thickness, remade for acrylic panels, changed the size of the original) and I have it worked for more than six months.Approaching the top thread, did not cause any problems.Bottom thread supply, resulted in the destruction device.Maybe it's my fault. I did a little filling.However, I completely remade the original design.I made a powerful console and changed profileThe thickness of my acrylic panels 7,6mm I made a device this size.I added a model for 8mm thick acrylic panels.Sorry for my English