Print head clogs at the same point every time...?

[Legolas]

Hi,
OK, total newbie here.
Although in the past I've designed stuff for 3D printing, up until now I've always sent the files away to a company to actually produce the prints.
But I've now taken the plunge and bought a Creality Ender 3 Pro to have a go at doing prints myself.

My issue is I've just been trying to print a simple frog I found online.
But it seems the head is clogging at the exact same point every time this file prints, resulting in a blob on the poor amphibian's neck and a messy slot of missing plastic around his throat.

I've checked the motion of all the rollers and moving parts in all planes and they all seem smooth.

Can anyone shed any light as to what might be causing this?
Thanks in advance.