<p>I had a problem with my Z limit switch bracket falling just short of the bottom edge of the z stage. </p>

<p>I'm trying to make the bracket thicker so it's pushed more towards the left. </p>

<p>1) how do I measure the thickness of the bracket in the stl
2) HOw would I make it thicker if it is indeed too thin</p>

<p><a href="https://i.stack.imgur.com/U1iy4.gif" rel="noreferrer"><img src="https://i.stack.imgur.com/U1iy4.gif" alt="enter image description here"></a></p>

<p>It's might to be mounted standing up right. </p>

<p>I want to make it thicker x axis (if it's stood up)</p>

Looks to me like you have your slicer set to 3mm filament when you're using 1.75mm filament. Confirm that your slicer has its filament setting set to 1.75mm and not 3mm (this obviously assumes you are using 1.75mm filament..)
Failing this:
Test extruder steps/mm
Ensure nozzle diameter is set correctly (usually doesnt make too much difference anyway...)
Ensure extrusion multiplier is set correctly.