These spark plugs were originally for a model rotary Wankel engine. The source file is in OpenScad and included so you can alter sizes to suit your project. The code will print between one or more spark plugs in one go.
I suggest printing at least three plugs at a time to allow the narrow parts to cool between layers. A raft reduces problems with adhesion to the print bed due to the narrow base but otherwise settings are not critical.
Included is are stl files which print the plugs print upside down to avoid the need for support.
Printer:
Kossel Mini from think3dprint3d
Rafts:
Yes
Supports:
No
Resolution:
Layer 0.3mm thick 0.66mm wide
Infill:
20%
Notes:
Printed in PLA and I used the inverted stl file to avoid the need for supports
HT Connector
To complete the model there is a hole in the top of the insulator suitable for a 8mm long 2.5mm dia machine screw.
OpenSCAD
Being familiar with programming code I just followed the cheat sheet in the OpenScad documentation.
