The file 'Generator Exhaust Extender ( Model 88 Spark Arrestor Pattern ) 3D Printer Model' is (stl,FCStd) file type, size is 424.1KB.
Wanting to add a metal muffler extension pipe to my Champion brand 3400W inverting generator, I removed the model 88 spark arrester cover (which is very common) to scan & draw a CAD drawing for an extension.
The design was rather straightforward; it was the remaining casting with aluminum which was more challenging.
The parts provided here are the mold pieces to be used in a sand-casting process. The two-part core is what provides the hollow portion of this part - you could opt to drill that part out instead of fussing with making a sand core. The part was cast using scrap aluminum and works beautifully when coupled with a 1" metal flexible exhaust pipe / hose.
muffler_extension-core_parts.stl | 66.1KB | |
muffler_extension-mold_parts.stl | 129.0KB | |
muffler_extension.FCStd | 377.9KB |