Cheers, are you saying you tried 3mm inner / 5mm outer bpt pipe in the bellow
from 100ml calibration, 1mm-10mm seamed perfect, but 25ml was out. but this could be down to RPM im using
Going from ebay one site said 50rpm max, produces 160ml,
50rpm certainly doesnt produces 160ml, I ended up running it at 200rpm as i found another site suggesting 300rpm was max