Calibration thin wall cube

I printed a model of a .4mm wall cube and the actual wall came out .75-.80, what all should I adjust in Slic3r to get my part correct?
Im using a .4mm tip on a magma hot end with .2mm steps on the z

Edited 1 time(s). Last edit at 03/03/2014 11:45PM by Floyd.

I don't think you can get this resolution with FFF technology. To begin with, you cannot get less than 0.4 mm resolution with a 0.4 mm tip. Moreover, actual resolution is likely to be worse, since fused plastic is intended to be smeared on the lower layer and therefore it will get wider than the nozzle size.

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To begin with, you cannot get less than 0.4 mm resolution with a 0.4 mm tip

Sorry jameson...The above is not correct...

I print 6-8 hours 5 days a week, use a .35mm nozzle tip and print at 0.1mm Layer Height Resolution and maintain tolerance of +-0.05mm for all dimensions (except having slightly smaller hole I.D.s).

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Floyd, if your machine is perfectly calibrated, perhaps your flow rate or extrude temperature are having a negative influence of your desired dimensional size.

Edited 1 time(s). Last edit at 03/05/2014 12:04PM by ShawnT98027.

I will post up a picture of the box tonight and show you another issue I was having.
When it starts a new layer it doesnt look good, sometimes I get little blobs and other times its acting like its underextruding. Everything has been calibrated and the box looks great other than where it starts and stops for the layers.
I have retract on at 1mm at 30mm/sec and for the test I was at 50mm/sec on the wall.
Temp is at 225c on the tip and 110c on the bed.