Hey there guys!
Total noob here - I drew this simple object in sketchup and exported it as an stl for printing, but once I got it to slic3r - I’m getting all sorts of errors but I can’t see anything wrong with the object :S
Here is the sketchup file :S any ideas on what i did wrong greatly appreciated 
Tv Bracket .skp (11.8 KB)
Thanks! 
The only thing I see wrong (after quick look) is that a few of the surfaces ( ones darker) are the back faces. Click on these to highlight, right click, then choose “reverse faces” - turn them white. See if this helps.
Thankyou so much!!! it sliced straight away - however it says “model has overlapping or self intersecting facets…” it still worked but any idea what thats means?
thanks again!
Make the object a Solid Group or Solid Component
See these pages by Aidan Chopra…
Understanding Solid Objects in SketchUp
http://www.aidanchopra.com/web-content/chapter-6/understanding-solids
thanks guys
how exactly do i make it a solid group? not sure if it matters but i am using an older sketchup version on a mac
thanks!!
In your case it’ll become a Solid very easily…
Make sure all of the faces are consistently oriented outwards [so no blue backs are visible], the select all of the geometry and use ‘Make Group’.
Select it and ‘Entity Info’ will say it’s a ‘Solid Group’.
If it does not include the word ‘Solid’ in the header then there is something wrong.
Typically you have nested non-geometry, faceless edges, holes, internal partition faces etc [every edge must have exactly two faces…].
Using Xray mode and temporary section-cuts can help you see these and delete/fix them.
If the problem is less obvious then there is thomthom’s SolidInspector - v1 shows issues, v2 tries to fix them.
My own SolidSolver also tries to fix issues that prevent ‘solidity’ or would compromise 3d-printing…
Very complex mess-ups cannot be solved by algorithms.
Best to use your brain and do it manually.
Also note that a group/component may report as Solid in Entity Info, but still present exporting or 3d-printing issues…
The incorrectly oriented faces has been mentioned.
Another issue is with self-penetrating objects - where part of the object intersects with itself, but its geometry has not been ‘Intersected’ - this gives a manifold solid as far as SketchUp is concerned, but one that can’t be 3d-printed.
You can always edit the group and select-all and Intersect > Selection.
If it then does not report as a Solid it needs fixing.
My SolidSolver does this step automatically for you - intersecting and fixing if needed…
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It’s not clear what you’re asking…
• How to create Groups and Components?
Or
•What makes them a Solid?
Making Groups and Components
What is a SketchUp Solid
A Solid in SketchUp is a single Group or Component whose geometry meets certain conditions.
When those conditions are met, Entity Info indicates the model is a Solid Group or Solid Component.
Also notice Entity Info indicates the Volume of a selected Solid.
• The geometry must form a single* airtight vessel.
Like a perfect soap bubble … •No gaps •No holes •No leaks
• No extraneous Faces** inside or outside the vessel.
All Faces must serve to enclose the singular volume of the vessel.
• No stray Edges.
All Edges must serve to support a Face that in turn serves to enclose the airtight vessel.
Thus, each Edge supports only two Faces … no more, no less.
• No nested Groups or Components.
*A Solid Group or Solid Component may contain one or more separate airtight vessels.
**Best that all Faces are oriented Front Side (white) facing out.
