[Cura making prints bigger]

So this is a new one on me. I am using a Voron 2.4 using ABS.

 

Whenever I slice anything with Cura it is making the prints much larger than they should be. I first experienced this with Cura 5.3 so I tried a previous version and the exact same thing is happening. When the larger prints were coming out I thought it must be a printer fault. But when sliced with Superslicer the dimensions come out correctly. When I view the sliced file in Cura is states that its 30mm on each side as it should be. But when I upload it Mainsail I see the following dimensions. I can't understand where this extra 3.2mm is coming from....

 

Anyone have any idea why this should suddenly be happening?

 

[Z Offset bugs]

I’ll give it a go and see what I come up with. 🙂

[Z Offset bugs]

All the belts and pulleys have been tightened. First thing I checked. As I say this issue only cropped up immediately after installing that plug in. 

[Z Offset bugs]

Hi everyone. I’m a newbie here and have only been printing for three weeks. So please bear with me if I haven’t given enough info. 
 

I have a Tenlog TL D3 Pro. I managed to get it all calibrated great with PLA and recently I have been calibrating it for PETG as that will be the main material I’m printing with. I downloaded the z-offset plug in and as soon as I downloaded it I started getting the pictured error. Where prints will shift on the x axis either halfway through the first layer or shortly after. This happens with every model I have tried. 
 

I uninstalled the plug-in but still had the issue. I’ve tried uninstalling Cura, reflashing the firmware of the printer and still I am getting the issue. 
 

The only thing I can think of is that the plug-in embedded something in the g-code but as I’m such a newbie to g-code I wouldn’t know what to look for. 
 

Is this a g-code issue do you think? I’ve checked all the hardware and I can’t see any issues there. 
 

thanks for your help.