This model was created by Coolcrawler_ on Thingiverse. Check them out at https://www.thingiverse.com/Coolcrawler_/about
The stock extruder on most Creality printers is known for its flimsiness. This replacement is a must-have for those who don't want to buy a metal one just yet and are waiting for their time to buy one.
I printed mine at 100% infill, it took about an hour total to print them one at a time.
The user re-uploaded this model. The user is not the original author of the model.