Sorry for the late reply their pikilik. That is an impressive split you have going. I can see some pretty interesting layer lines there, it could be under-extrusion. how long have you been using the Ender as it might need to have the nozzle cleaned to make sure you don’t have a blockage, or increase the extrusion speed a little. Also you have a decent layer shift there near the top of the piece which screams that you need to tighten your belt a little.