Hi, I am desparate and willing to pay anyone that can help solve my printer problem for me.

S3D support and Craftunique are unable to isolate despite much problem solving.

Random and slightly diagonal lines/streaks across my PLA prints.
1.5yr old Craftbot3 (CoreXY design) with moderate usage.
Problem only started recently.
Started on head1 then eventually started on head2.
Layers are about 1-2seconds long