I have PowerSpec 3D Pro 2 (Flashforge Creator clone) printer. I use Simplify 3D software. I was using the printer this weekend to print out model engine parts. I found out that there is under-extrusion or partially clogged nozzle. Are there metal tubes that replace PTFE tubes? I know that there is Micro Swiss All-Metal Hothead but I had them on my PowerSpec 3D Ultra (Flashforge Dreamer clone) printer that broke down and I broke the hothead tube while trying to fix it. Any suggestions?