Fuel tank cap for Vari Zongshen engines

Cap for fuel tank, I dont know the name of this kind of thread, but there was no model on the internet which would fit.

I had to design it in 2 parts, because the overhangs on the threads are printable only from bottom to top. I needed nice inner finish of the cap for the rubber seal, so the top of the cap has to be printed separatelly. Later inserted into the main body during the print before the layer with bridge (pause the print or add a filament change at this layer). It prevents bridges going wrong and there is no need for supports.

I used petg, 4 walls, 4 botom and top layers, 30% infill, 0,15mm layer hight for area with thread, 0,3 for others