Hello, I made my printer operational yesterday it is the Anet A8 printer. We made sure everything worked and printed a filament guide to make sure that everything ran smoothly. We then printed an improvised cooler suggested by every forum I read on the printer. Sadly today every print has been a complete failure. The Extruder heats up to a solid 190C for a very long time and it prints fine but near the end of the print the extruder drops in temperature all the way to room temperature. This udderly ruins the prints and it does this near the end of the file. We use cura the program that came with the printer to splice the prints. We also tried to print a robot by stacking several on the board but it did this. We then tried only printing one of the robots and it did the exact same thing. Keep in mind this file came with the printer which it should work. We have tried several steps to troubleshooting this but it was in vein due to it still not working.
Thank you very much, Lions2020
P.S. Attached is Pictures of the robots
Update: Thank you for all of these great responses! They all helped fix it together! Thanks everyone who suggested these fixes!