Export to CAD Issue

[norcaljess]

I have a doozy!  We have been working with a mechanical contracting company to do coordination.  Up until this week, they have been receiving our Revit file, exporting a 3D view to AutoCAD, then importing that view into Navisworks.  This week they had me do the export because Revit is crashing after I upload our model to them.  They are telling me that before, when they did the export, it was showing existing pipe/duct on an "EXST" layer in CAD.  However, now when I am doing the export, all duct/pipe is on the same layer, with no differentiation between existing and new.  Does anyone have any idea what I can do to export in a way that the layers in CAD do this for them?

Thanks!

Jess

[Jrobker]

Previous to 2012 you couldn't

In 2012 you can go to the export settings and specify which layers of the same category you want to differentiate.

[norcaljess]

Really?  I opened my Export Layers Options and there is a category for "Existing" with settings to name the layer "-EXST".  Is there something different in 2012?

Thanks

Jess

[Jrobker]

Ohhhh... ya your right.

That was based off of the phase settings.

I was talking about having the ability to export duct based off of system and assigned a different layer rather than just exporting all of the ductwork to just M-HVAC-DUCT. Soooo, that didn't even apply to your original question.

If your elements are assigned the existing phase than it should be exporting those with-EXST appended to the end of the layer name.

I just did a test in 2011 and it works.

Are you using the defaults in the export dialog?

Maybe there is a glitch if you change any of the properties.

[norcaljess]

I tried it with the default export properties.  I tried changing some of the properties.  Maybe it's just a glitch with my version of Revit??  This is annoying.

[Jrobker]

I would start a new model using the default OOTB template, model 2 pieces of duct and make one existing. Export that file and see if that works.

We than will be able to narrow down what's going on.

[julianjameson8403]

Have you asked the contractor for their .txt file that they use for CAD exports?