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@paul russam said:
I used to be more active here but I got made redundant and whilst I’m now back modelling I find myself engaging in posts less than I used to. I still check new post on almost a daily basis and +1 posts I enjoy/appreciate/learn from.
+1
My first try would be the plugin FixIt in this case...
(click for animation)
I've rendered it with Indigo as a standard glass material and an EXR as the environmental lighting.
Have you tried this plugin from Thomthom?
http://sketchucation.com/forums/viewtopic.php?p=385808#p385808
Does a restart of SketchUp help?
Great result and model! 
(I couldn't resist to render it...)
Maybe this plugin can be helpful here too: http://sketchucation.com/forums/viewtopic.php?p=138042#p138042
With the SketchUV tool active, you have to right click on the face to get the different mapping options...
For me, the main disadvantage is the missing extensions functionality.
I've printed a lot of models in 3D and all of them were modeled with SketchUp. Maybe you should have a look at an online printing service instead?
I've watched the basics video and enjoyed it!
You will never get such a date because it's against Trimbles philosophy. Extrapolated from the past few year, it will probably be released before 2019...
