SRT Extended Shift Knob

An extended shift knob I designed for a friend who is obsessed with all things SRT Hellcat. However, he finds that the knob is too short for his liking and that reaching so far down interferes with his driving. Being the awesome friend I am, I designed this longer and ergonomic shift knob with his favorite three letters embossed onto the top.

Autodesk Inventor Professional 2025 was utilized as the design software. Followed with a 3D Printer to print the shift knob out. The specific material used was 3D Printer Filament.

Draw a 30mm circle.

10mm Extrusion.

2.5mm Fillet top edge.

On the underside (opposite to the recent fillet.) 25mm inner circle, smaller than the diameter of the entire knob.

Extruded the surface of Step 4 to 2.5mm, using the "Flipped" direction.

30mm outer circle, matching the total diameter of the knob.

Extruded the surface of Step 6 to 2.5mm, using the "Flipped" direction

Repeat layering steps 4-7 until desired amount. I did this a for a total of 8 divots.

Sketched the lines above.

Use the revolve function to create the rest of the body. 360 degrees. (See 2nd image for after-result)

Inserting SRT Logo, and scale it to fit to the top of the Knob. (~15mm)

Start a new sketch on the surface of the image. (Tip: holding down the ctrl key while tracing helps with tracing the edges and prevents the cursor from auto-snapping to an imaginary grid.)

Select the 3 outlines of the traced letters, and with the extrude function, extrude all 3 profiles each to 1mm deep.

Done.