HEADSHIFTER

Your TH8S upgraded

HEADSHIFTER is a modular shift knob for the Thrustmaster TH8S. A weighted base stays on your lever, and the heads swap in a ¼ turn. Want more heft? Drop washers or coins inside. Want a new look? Twist, swap, done.

Highlights

• ¼-turn head swap: 3-lug bayonet with a ramp that pulls the head down. No wobble, hard stop at 40°.

• Adjustable weight: +0 → 105 g of ballast, so the knob goes from about 122 g to 227 g.

• Zero supports: every part prints upright, with all overhangs at 45° or less.

• Official interface: built on Thrustmaster's own TH8S adapter files.

• Can't loosen itself: heads lock clockwise, the same way the base tightens.

You need

• The official Thrustmaster TH8S adapter (free on Thrustmaster's Printables page)

• Ballast (optional): M12 washers (ISO 7089, Ø 24 mm), 1 € coins or US quarters

• A coin to turn the plug.
  
  That's the whole toolbox.

Print settings

All parts:  0.4 mm nozzle · 0.2 mm layers · PLA or PETG.
Base: turn on elephant-foot compensation. The official thread sits on the bed and must not be pinched.
Print the Blank head first to check the fit on your printer.

Assembly

1. Screw the base clockwise onto the official adapter until it seats.

2. Drop in the weight: washers or coins, flat in the chamber.

3. Lock the plug: screw it down with a coin until it touches the stack.

4. Push & twist: line up the 3 notches, push down, turn ¼ clockwise to the stop.

To swap a head, hold the ribbed grip ring and turn the head counter-clockwise.

Pick your weight

*Classic head, PLA, 5 perimeters, 15 % infill (estimated).