Cura - slicing issues - first layer "sunk" into glass?

[ehcropydoc 0]

Trying to print a 3D turbine engine. My issue is that once importing certain items into Cura, the first bottom "support" layer (provided by designer) shows as gray in cura and doesn't print. Its like the object is sunk into the glass and is omitting the very first layer. This only is happening on certain parts and I am not sure how to fix it.

When looking at the solid view, you can see that the support is clearly underneath the fans. However, when bringing it into the first layer view, it is completely omitted. Side fact, when looking underneath, the first layer is red. Not sure if this has anything to do with it.

Item I am printing: https://www.thingiverse.com/thing:1327093

Example part that doesn't want to print correctly: LPT_Stage_1_Stator_With_Supports.stl

Screenshots of what I am seeing:

1st Layer View:

Solid View:

Underneath Solid View:

Thanks for anyone who is willing to help!

[kmanstudios 1,120]

The file (I downloaded and checked) just needs to be raised 0.2mm in the z direction. Sometimes a model's pivot or something does let it sink below the surface. But you can raise the model up or down.

You may have to go into preferences and uncheck "Automatically drop models to the build plate" so that it will 'stick' at the desired height.

The object seems ok in every other respect.

[burtoogle 515]

Yes, it's OK with z = 0.

[kmanstudios 1,120]

Yes, it's OK with z = 0.

Hmmmm, I wonder why that would be? At 0 Zed, I get this just as the OP did:

So, I had to go to 0.2mm Zed to get what you got.....

Which makes me wonder how accurate the software is. That is not a little discrepancy.

Edited December 9, 2017 by Guest

[kmanstudios 1,120]

Yes, it's OK with z = 0.

Hmmmm, I wonder why that would be? At 0 Zed, I get this just as the OP did:

Edit:Clearer comment.

I had to go to pos 0.2mm to get the bottom to sit on the plate and not cut any depth off the part.

Which makes me wonder how accurate the software is. That is not a little discrepancy.

[burtoogle 515]

Sorry, I just realised that I used the wrong model, here's the right model (still looks OK to me). I did have to reduce my first layer height to 0.2 from 0.25 otherwise it didn't print the full width of the support piece. What initial layer height are you using?

[kmanstudios 1,120]

I am using 0.2mm layer height and the piece was sinking at 0 zed. Again...weird.....

[ehcropydoc 0]

Ok well at least I am not the only one seeing this issue. I also have raised the part by .15 on the Z and I should be doing a test print sometime today.

I just wanted to be sure it isn't something I am doing incorrect.