Ukulele tuners - Model 3

This is the third iteration of my ukulele tuners. This new version has a number of improvements.

• Only two, #2 3/8 inch screws are needed per tuner, instead of 4 required for the model 2.  The equivalent metric screw is M2x8mm.
• Reduced backlash
• A new, easier to print, tuner knob (button) is included in addition to the older style.
• Separate tuner knobs and worm gear files are included as well as a part with knob and worm gear together to print as a single part
• A little bit smaller volume
• Like the Model 2, these are substantially stronger than my original version.

Updated 2-9-2025 : I have added a version of the worm gear with a hole in it for inserting a 2 mm carbon fiber rod, for added strength when the ukulele accidentally gets dropped :)

The video below is a sound demo for my new soprano guitalele and includes instructions on installing the model 3 tuners. 

One downside, the previous Model 2 was designed to be compatible with commercial tuners, the Grover ukulele 9NB. The Model 3 tuners no longer have the same screw spacing as the Grovers to get them down from four to two screws.

Check out my Soprano Ukulele, if you need a ukulele to go along with the tuners. It includes a new headstock designed to be compatible with the Model 3 tuners.

For each tuner you will need 

• Base
• Cover
• Worm gear
• Tuner knob
• Gear
• Two, #2 3/8 inch wood screws

All parts were printed with 5 shells and 50% infill. I use a brim for the worm gear.

For added strength, I started printing the peg gear with it rotated to 45 degrees.  This requires supports.