There are some issues with the full sized pump, too. I fixed them and made a scaled down version of it in the same file. A good way to to check is to make a component of the model and see if SketchUp reports it as "solid". You have some internal faces that need to be removed. See the first three screen shots. [image: 8RaX_GP1.png] [image: rLDC_GP2.png] [image: ldHu_GP3.png] They're not only internal faces but the sort of mottled look indicates there are two faces in the same space. The mottle look is referred to as z-fighting. After clean up the pump shows as solid and you can see those internal faces have been removed. [image: YGd3_GP4.png] If you are wanting to make this as three separate pieces, you would want to make three separate components and possibly different SKP files for printing. Do you intend for the glass reservoir to be printed as transparent? By the way, I think you would find it much easier to draw things like this if you turn off endpoints, set precision higher (1/64") and turn off Length Snapping. If this is to be a single piece when you finish, you could have drawn a section profile and used Follow Me to make it 3D and for no bigger than the final model is, you probably don't need 108 segments in your circles. If you'll be doing much of this you'll probably find the following Plugins useful. ThomThom's Solid Inspector. TIG's Solid Solver. GASPUMPV7 final.skp