It's hard to print the Snowden glasses small on an FDM printer. However, it's easier when printing the halves separately. See the instructions for instructions on how to hack your gcode to get the side pieces right. Update Uploaded example .gcode files (Ultimaker flavour, 2.85mm filament).The side pieces can be a problem. My solution is to have the printer make them with a straight vertical move (instead of stacked circles that most slicers will produce). Here's how (tested with Cura 15.02.1): After slicing, edit the gcode. Depending on your printers characteristics (especially regarding oozing), you may also have to try the following iteratively: