You can see here as I’m printing Bulbasaur with the same settings… The edge where there is overhang is starting to curl up. Any advice would be great.
If you have controllable fan mounted near the hot end you can turn it full to cool down the part; another easy solution is to slow down the print speed to let the material cool before laying another layer on it. Normally this should reduce the curl.
I’ll try the fan idea. I already have it printing at half default speed. Around 1250mm/m I think.
Another strange trick is to print two copy of the object on the same plate (If they are not too big) so a part has the time to cool every layer when the other is printing, obviously the time is doubled, but in the end you have two objects 
If you print a 20mm cube, are the edges bowed inward? Under-extrusion will also curl upward with overhangs as there is not enough plastic extruded to create the desired geometry. I assume Replicator, which I am not familiar with, but generally printing slower/multiples just bandages a bigger issue. I also generally avoid low temperature printing, sticking around 200C-210C for PLA, to avoid bad layer adhesion & jamming but my ToyBuildLabs filament is meant to run high anyway.