Poor print quality on one side???

I completed my Prusa and am know trying to fine tune it, the biggest problem i have is when i print is that one side of my print come out in poor quality while the other side comes out perfect? this will happen repeatedly on the same side as you can see in the pictures. one side looks fine and the other has sagging parts that stick out. Does anyone have this problem or know how to fix it?
Thanks

Hi,

What settings do you use when printing, layer height, nozzle size and others? From your pictures it seems to me that you have little adhesion between the layers, try the calculator here: [calculator.josefprusa.cz]
You don´t happen to have a cooling fan directed at the "good" side of your prints?

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Prusa with cast PU parts, RAMPS 1.3, Wades extruder, J-Head hot end

layer height is 0.4, and nozzle is 0.4mm, yes i have a fan directed at the good side, but i did try a fan at the bad side aswel and i dont think it made any difference? im using slic3r. im not to sure about some of the figures in the calculater or where to put them in slic3r
Although i have just noticed that i should be printing at 0.25 layer height.
thanks for your help

are you sure z axis is calibrated correctly? it looks a lot more than 0.4mm, going above nozzle diameter in height is a sure way of having print problems.

Drop down to a .35 or .3 mm layer height. I'm running a .25 nozzle and see a world of difference between a .25 and .2 layer. My 'ideal' layer height is .15 mm with my nozzle.

While you can print at a layer height of your nozzle, layer to layer adhesion will be weak, and blobs and other print problems are unavoidable.

Hi thanks a million for the help adjusting the layer height to 0.3 has gotten rid of the problem.

Having another problem, seems to be one thing after another! ha the prints keep failing and coming off the heated bed. The printer warms up to the right temperature fine at the start. the bed temp target for the extruder is shown at the right temp.
however the bed temp target is not shown from the start, the orange target line doesnt show at all?
however the bed does show that its at the right temperature... until a few lines before the end... the bed seems to turn off completly, i cant get it going again. and the print fails and breaks off the bed????...

Has anyone had any experience of this?
cheers

have also just noticed when i set the target for the bed temp maually it does not heat up? it seems to be on and off. it was working fine??
so its strange

i have also just noticed that the resettable fuse is very very hot, i dont know if this is normal?