Thanks for the hints.
Levelling the bed gives me huge amounts of grief
Spent a while on it last night and had got pretty happy with it, but I'll check again - I can see how it would cause blobbing if the head pushes stuff around.
I've not checked the small belts recently - a cursory look seems that they are ok, but I'll make certain. I presume there isn't such a thing as 'too tight' for these? Just push the motors down firmly and tighten the bolts? I seem to recall someone suggesting in a comment on the build instructions that it could be good to file a flat area onto the drive shaft from steppers so that the pulley screw has something more to bind against - is this a possible area for slippage?
Is slippage or inaccuracy really likely to be the problem, given the way the fill reaches the other edges, in all directions, but just not around the centre? Is it perhaps a problem in my model (built using sketchup) and the combination of settings I've used?
A query regarding the small belt for the Y axis: it doesn't run straight up/down the way the X axis one does - this has to be normal I presume, given the positioning of the motor and the axis rods (rails? terminology anyone?). The belt doesn't touch wood anywhere.
I presume oiling all the rods occasionally can't hurt - what about the bearings at each end of the rods?
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Daid 306
The blobbing on the first layer is usually because the bed it not at the perfect level. Usually the 2nd layer will flat this without problems.
Belt tension. Did you check the tension of your small belts? You mention you have tensioners, but people sometimes forget that you also need to tension up the small belts by pushing down the motors.
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