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As per diagram i have model. I want to make the handle of 180mm as mark in red.

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I have tried so far.

Any suggestion or help how it works.

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I do a lot of modelling for 3D printing, my favorite method for getting dimensions exact is the following:

  1. Make sure vertex auto-merge is off

Step1

  1. Grab the verts you want to make precise and snap them to the vert you want as your "FROM" point "G -> hold CTRL to snap"

enter image description here

  1. Then grab them and move them along the axis you with to move them "G -> Z" and type in your amount "180"

enter image description here

Be aware that this works well for high poly meshes, but low poly meshes will have different dimensions across the centre of a face compared to the edge between 2 faces

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