Hello again... Posted along time ago about some coaches i was hoping to 3D print, which sadly after 8 months I still haven't go to due to a number of issues. Ive managed to get the chassis uploaded no problems, so they are about ready, but was hoping to put one coach in complete to see how it would come out fit together ect... I have since the first time, re-drawn the model 3 times to try and improve it as when uploading the repair system on the website used to take a number of parts away which were mainly details. Having fixed the sides... I now have large parts of the model disappearing. I have been receiving help on these as well but he is a bit at a loss, and not sure why its doing what its doing when its uploaded as he believes its ok, its been put through Netfabb... several times, but always having the same end result. So Im not sure if its an original design issue, a face / mesh issue... It was original designed on Sketchup... as I don't really understand any other 3D design program, as they are a little complex for my small brain. These are then re-scaled and checked on NetFabb. The worry i have is I have 2 other coaches on the same base shell so i can probably see more problems on the horizon... so need to know what is causing it. I have attached the STL scaled file, if needs be I can upload the original SKP file which is bigger, or even the coach shell it is designed on.