Universal Fluted Shift Knob — 5 Thread Sizes (M10x1.5 / M12x1.25 / M10x1.25 / M8x1.25 / 3/8-16), 3D Printable

Universal Fluted Shift Knob — 5 Thread Sizes.

A clean, original touring design with 12 grip flutes and TRUE modeled right-hand internal threads. Each knob screws straight onto your shift lever — no tapping, no adapters, no guesswork.

INCLUDED THREADS — PICK YOURS: • M10x1.5 • M12x1.25 • M10x1.25 • M8x1.25 • 3/8-16

FITMENT — READ THIS: This knob fits ANY shift lever with a matching male thread. Thread size is the only thing that matters. Check your thread pitch BEFORE ordering: measure the lever's thread diameter with calipers and count the threads over a 10 mm span (10 ÷ thread count = pitch in mm), or test-fit a matching nut.

YOU GET: Five print-ready STL files (watertight, manifold, millimeters), one per thread size, with the threads modeled in — ready to slice and print.

PRINT IT RIGHT: ASA or PETG only — never PLA (a parked car in the sun will warp PLA). 0.15–0.2 mm layers, 4–6 walls, 40–60% infill, printed upright with the bore facing up, no supports. Run a matching bolt through the thread once by hand to clear any stringing.

SPECS: ~42 mm diameter × 59 mm tall, 30 mm thread depth. Original Forge & Filament design — no logos, no shift pattern, no manufacturer marks.

Not affiliated with, endorsed by, or connected to any automaker.