What I learnt:
Tiny hex holes that are spaced 1 mm apart take ages to print!
I'm sure a more experienced user could bend the slicer to their will to increase speed properly.
As you can probably see from the quality, I just span that knob to the right when I got bored of waiting :)
The author remixed this model.
Thanks to the original designer @TomTom_563368 for the original model and step file.
I just threw a bunch of hexagonal holes on the rear for kicks, and possibly better convection of heat, who knows?