Hi Skinny and yellowshark, thanks for the responses.
The setting are below:
Quality
Layer Height (mm): 0.1
Shell Thickness (mm): 0.8
Retraction Enabled
Fill
Bottom/Tip Thickness (mm): 0.6
Fill Density (%): 15
Speed and Temperature
Print speed (mm/s): 50
Temperature: 220C - We've had to run it at the higher end of the PLA range to try and counteract the patchiness, but it does seem to be getting progressively worse.
Yellowshark how do I reduce the bed to nozzle distance to 0.04mm? currently using the paper method for calibrating the bed.