Toolpath generation for extrusion-based additive manufacturing systems, called slicing,
involves operations on polygonal contours that are derived from an STL file. Slicing generates
multiple paths per layer (both closed-loop and open-loop) that are designed to optimally fill the
space outlined by the polygon(s). In the course of printing a layer, the extruder must start and stop,
the tip must be wiped, and the extruder must travel between paths without printing. Any amount
of time the printer spends moving without printing is considered wasted time because the part isn’t
being constructed. In addition, the start/stop point, known as the seam, is often a blemish on the
surface of the part that contributes to weaker material properties. Therefore, a single path for
creating multi-bead walled structures is desirable because it would save machine time and create
parts with better surface finish. This paper will cover one method of modifying the CAD file and
slicing engine to allow for parts to be printed without starting and stopping the extruder.Mechanical Engineerin