pictures of my prints, what do you guys think is the problem? (Page 1 of 2)

here are some more pics

First thing... If that filament sat in the shipping container dehydrate it or throw it away.  A lot of what you're seeing is caused by moisture.
Second... You should use a layer height of .2963 not .3  and make sure your Z-axis is actually moving smoothly. Lube is your friend.
Third... You have your nozzle set to .40 so that means you should be adjusting your extrusion multiplier to achieve a single wall that is .48  Also you want to set your extrusion widths to .48 so the tool path actually matches what is being put down.
Of course I am assuming you have properly set your steps/mm in EEPROM

+1 on Ward's advice and I would also recommend tuning the vref for your extruder motor driver which may be a cause of what appears to be pulsed, periodic, or generally uneven flow from your extruder.  Which model of printer and motor drivers do you have?

Edit: Also consider turning down your hotend a little to cut back on oozing.  This can be different for every filament so it takes some trial and error.  I usually run around 210C and keep my bed around 95C.

I tried the layer height setting , extrusion width and chancing the filament.
i still have the same result i guess.
I played with the extruder steps in eeprom to set it properly but so far no luck.

i used a brand new filament for the white ones. i am not using the same old one.

I ll dig into VREF tomorrow when i have the right equipment.
E step is set at 101.7. I did the calculation but if you are sure i ll give it a try.
Without these last 2 recommendations,  i managed to get some better prints. They are not yet perfect of course.
I think i have a problem with the z axis. If i dont select random start points on slic3r, there is always somr more plastic on one edge of my square calibration parts. White ones are the new stuff, red square is the old one to compare.
i also tried a replacement part before this cube. Outer layer is still better than the red cube but not smooth.
thank you for all the help. Without your recommendations i would suffer a lot.

https://www.youtube.com/watch?v=p0RYe-3bi8g
extruder is tight. I checked and there is no problem there but my z rod is in a bad shape. before i saw your post today i also noticed this while checking the forums for a solution.
Do you think i can still use it with an anti backlash nut or should i change it?
if you think i can still use this one (not have to be perfect but at least ...) is there a printable z wobble fix you can recommend?
i am printing this one to see the result. Www.thingiverse.com/thing:646436

what is the size of the original solidoodle 3 z rod? My caliper is gone crazy this morning. It is showing random numbers. I ll get a new one today.

It may take some time for me to get a new rod. I wish i was in USA when i need these kind of parts
by the mean time i printed a temporary solution and trying my first prints with it.
On my calibrstion cube, my left front side is defective a little bit. This spot is the spot on the layer where z axis moves 1 layer down.
Do you think new rod would solve this as well or there might be another problem too?
thanks a lot for the help.

I tried the retraction . Do you think i am using the correct settings on slicer. Here is the results
i choose random but it keeps using the same spot. Is thete another setting?
thanks a lot

I choose it but i dont know what makes the problem.
i played with the retraction settings a little and here are the results. Seems betyer than the old one

That last picture looks like it is getting better but until you fix the z-wobble it's going to be hard to tell.  Given your situation I would consider pulling that motor and threaded rod out.  Then use a good flat surface and see if you can't straighten it some.  You really have nothing to lose.