Problem with 'Stepping' in straight Lines

I have this problem long time now and drives me crazy ... I can't find any solution .. i have change different versions of slic3r i have tweak the setting in marlin firmware but the problem still remains always in the same parts always in the same spots..
as you can hear in THIS video in the straight lines the printer makes small rapid moves ('tak' 'tak') and ruin the print




As you can see from the other side of the part the lines are straight




I Have a Prusa i3 printer runs Marlin firmware, i slice with slic3r RC3 and print with repetier

Any help it will be appreciated.

Anyone ?

It's not a slicing issue. It's either mechanical or electrical in nature. There may be binding or friction around the belt or bearings or your voltage is not set properly.

It's definitely in your X-Axis though.

Yes ok but why they make it in certain parts and not in all parts i print ??

There could be a problem with the file you are printing and that's just how it looks. Are these files your own creation? If not, do other peoples prints of those parts look different?

The annoying noise I'm hearing is on the X-Axis. The "Tak-Tak-Tak" I'm hearing is coming from your Y-Axis. That may even be the teeth of your belt skipping on something such as the edge of your belt guide or motor pulley.

You may be hearing it in the same spot on prints no matter what slicer you use and on different spots on different models, because of speed issues. If there IS binding or friction, then your motor may not be able to accommodate the printing speed movements set by your slicing software.

Edited 1 time(s). Last edit at 03/13/2014 12:58PM by KingRahl.

Yes this file print's from other people and printers correct .. no this files is not my creations but and with the files i create ..in certain files i have the same problem..
This annoying 'Tak Tak' comes direct from the motors 100% i have noticed very well ..my axis is tight and calibrated and the problem is that comes from both axis X and Y but in particular movements ..

Explain me please what is exactly the IS binding ? maybe is speed problem i run my printer in very slow speed because i have extruding problems from my crappy hotend..

Edited 2 time(s). Last edit at 03/13/2014 01:15PM by pelo13.

First did you build this printer yourself?

LM8UU bearings (especially from HK) can have excess friction inside if not lubed properly.
Your smooth rods your bearings on, if not machined properly, could have varying thicknesses. Causing tight spots for the bearing.
Also your smooth rods could have a tiny bend in them. This causes the them to not be exactly parallel. This will create a bind.

Are all your motors the same? Can you change it out with one from the Z-Axis? If there is something wrong with the motor, then this will let you use that motor less.
The noise is coming from the motor 100% means at least one of three things.
1. Voltage not set properly
2. Bad motor
3. Binding/friction is creating a force your motor is trying to overcome.

To diagnose some problems:

Remove belt and see if axis moves freely with very little force. You will be able to flick it a little and the axis will continue to move. Or you can turn your printer on it's side and the axis will freely slide from one end to the other. You are looking for any spots that take more force to push past.

If you suspect the rod is bent. Remove suspected rods from your machine, find a know flat surface, and roll your rod. Look for high spots. If you can put a light behind the rod and can see the light under the rod, it's bent in that area.

With belts removed and filament removed from hot end, "print" a part. If you hear those noises from your motors without any opposing forces (the axis) it's either your motors or the voltage applied to them.

Yes The printer i build it my self ... and i see that i haven't done almost anything from the calibration tips that you have suggested ...

my bearing is lubricated proper but i haven't check my smooth rods alignment or if my x and y axis they moved so smooth as you suggested..

yes my motors is the same and i have the felling that is total crap Chinese staff ... i can't find anywhere in the net any documentation for that.. but nevertheless i try all the rest suggestions before i change it with something better.
my motors is connected proper 100%.

i Thing i have a lot work to do , and i come back ...i hope with positive results ...

Thank you very match for your time!!!!!!