If you have read my previous posts about replacing the hotend, you've probably already realized that changing the hotend is a tedious work.
Most of the difficulties comes from:
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 filamen...
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.