CFTBL Shifter Knob, dimensions: 56.22 x 83.29 x 71.05mm or 2.21 x 3.28 x 2.80in
*Update 12-22-20 I have added an additional head with out the base for other uses.
Scale up or down as needed but... Current size is set to fit the Dodge Challenger/Charger SRT/Scatpack/392 manual transmission.
The size and resolution at 250k poly is more then enough for any knob shifter but may require a different thread type.
I'm happy to help you with any shifter needs but, if you need help with the file for a different model car please ask prior to purchase. Most can be modified easily, some not so easy.
If you need a file without a hole to drill/tap/thread (yourself) just let me know, no problem.
FFF/FDM must print solid 100% infill, resin SLA/DLP use a durable print material.
Even with the M8 x 1.25" thread, I recommend tapping the hole to clean out any print issues for a good fit.
I would not recommend PLA if being used in a vehicle (gets too hot in the summer), PLA warps. ABS or Nylon would be best.
If you need any help with the file or have questions, just let me know.