How do I mirror a body properly?

[autodeskN884Q]

I have an extrusion which I want to print with a 3d printer. The extrusion is too wide to print in one rush so I want to split in two parts with a simple connection.

Let's call them extrusion A and B

You can see A in the picture below. The connector from A to B is on the right side

Extrusion B shall be the same as A just mirrored. Like in the picture below

But the connector part should not be mirrored. I want to sketch the receiving part now.

How do I mirror my extrusion w/o sketching it a second time?

File is attached

Thank you

[wmhazzard · Accepted solution]

After the mirror, do a combine cut of the mirrored body and check the keep tools box. 

[davebYYPCU]

Delete the extrusion 3, that makes the joiner block - tab.

Copy Paste New - the A Component.

On Component A, redo Extrude 3.

On Component B, Make the socket from it's extrude sketch.

You will likely have to mirror Component B body to make Extrusion 4 go to the correct side.

Might help....