Railride----> I read your question on my mail box but it don't appear on the thread: window glass is from EVERGREEN, transparent sheet of styrene 0,25 mm thick ref # 9902.
jpv in France
Right after I posted, I looked back through the thread and saw where you already answered the question I asked so I deleted my post. Thanks for re-stating the info, though.
By the way, are your 3D drawings produced with the free version of SketchUp? I suspected that someone had come up with a means of converting SketchUp files to something that could be sent to a 3D printer, but wasn't so sure that also applied to the free version.