Early Porsche switch knob
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An early Porsche dash switch knob, M3.5. Switch part 901.613.043.00 (911/912), 644.613.501.00 (356), 356.61.045 (356)
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Updated at source:
Model information
- Source
- Printables
- Category
- Automotive
- License
- Creative Commons — Attribution
This is a knob modeled to match one that had broken off due to age on a pre-A 356. The switch paired with this knob was used on several Porsches, as part numbers 356.61.045 (356 pre-A/A), 644.613.501.00 (356 A/B/C), and 901.613.043.00 (911/912).
Like any other automotive interior part, this should be printed with PETG or another temperature resistant filament. No one wants to grab a half-melted PLA knob.
I found Paramount3D PETG Ivory to be good match to the original beige/ivory plastic. Original parts were beige/ivory, and black.
Print the knob with the hole end down, and with a brim to help with stability since this is a pretty narrow print.
This model was a close enough match that it self threaded on one of the switches I had available, but you can always use a tap drill to make it nicer. You'll probably find luck with M3.5 or M4.
Finishing with some light sanding, polish, and/or paint can help get that shiny look if you need it.