If you have followed my previous post, you know how to replace a 3D printer hotend.
Yet, I've made it multiple time and I'm now able to list the common errors to avoid, in the hope it'll save you time and money.
The provided hotend for the Sapphire Plus 3D printer is average. It's not correctly cooled, so it'll fit for PLA well, but it'll be less efficient for PETG. I haven't tried ABS with it. Also, the provided teflon tube has an hole that's too large for the filament...