Are copy parts value

I am an avid modder but had a thunk.

I am using E3D hotend bits in a new design and wondered…

. is the pukka heatsink required or use a copy at a fraction of the price?

the filament path is crucial but the top end is through a PTFE tube and the bottom end is a proper E3D heatbreak…

so does it matter what the outer shell (heatsink) is?