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Find the best answers to your 3D printing questions

Hello guys I'm kinda new using makerbot print and I've been trying to print this 3D model made in sketchUp... problem is that the software seems to create weird geometry by itself (like the attached picture) when I press "print preview" but on the "model view" everything seems to be fine?? HELP PLEASEE
Wow!  I am new and I don't have all the terminology down yet but I am going to try.  I recently bought the Qidi and for the first month it worked great, but all of a sudden the left nozzle has stopped keeping the filiment hot.  It brings it up to temp, but as soon as it starts to print it begins to cool down.  I sit there and watch it as it does this.  What is going on?  I tried searching through
Are there modifications I can make to the Wanhao i3 (such as replacing the extruder/hot end) to allow printing with 3mm filaments? Can anyone give specific 3mm components they know to run reliably with the Wanhao i3 please?   p.s. This is because I have a large amount of unused 3mm filament I would like to make use of.