🔧 Purpose

This knob is intended for applications where you:

• Need a robust, easy-to-replace thread

• Want to print spare knobs without sourcing special inserts

• Prefer a standard hardware solution instead of proprietary parts

• Use widely available prong T-nuts (pronged tee nuts) instead of heated brass inserts – no special tools required

The design can be adapted to many projects, including fixtures, jigs, tools, or machine handles.

🖨️ Printing Tips

• Material: PETG recommended for higher durability (PLA also possible)

• Layer Height: 0.2 mm

• Infill: 30–50%

• Supports:

– Required for the caps (due to overhangs)

– Main knob body does not require support if printed upright

• Perimeters: 3–4 recommended

🛠️ Assembly Instructions

Insert the prong nut:

• Heat the nut slightly if you prefer a softer press-fit.

• Alternatively, lightly hammer it into place if your print tolerances are tight.

Attach the cap:

• Align the cap with the knob body.

• Press-fit or glue in place for permanent mounting.

• The cap can also remain removable if preferred.

Mounting:

• Install the knob on your threaded rod or bolt.

• The prong nut provides a secure, reliable thread for repeated use.

Note: You can also flip the knob and print it flat (without the lower lip) if you prefer an alternative assembly approach.

📏 More Sizes / Variants

More knobs in this series are available in my profile:

• M3

• M4

• M6

• M8

• M10

• M12

All models are published separately to allow convenient downloads for each thread size.

KNOB - PRONG INSERT - M4 [SET 2 of 7]