How to set up a 3D-printed violin from a kit: tools, pegs, nut, fingerboard, bridge, soundpost, strings, and the tolerances that decide how it plays.
A kit gives you the parts. This turns them into a violin that plays well. It is reference material, so come back to it as you go. The order below is roughly the order you will work in.
Everything multiplies. Have everything but one item dialled in, and the instrument can still play badly.
A kit builder needs all of this, not most of it. Setup is where a printed violin earns or loses its sound.
Peg-hole finishing tool (peg reamer or shaper), available on Amazon and AliExpress
Do not skip the reamer. Poorly finished peg holes are the most common cause of slipping pegs on home builds.
They should rotate smoothly and evenly through all positions and stop without slipping anywhere. Three things achieve this:
The peg makes at least three contact points in the hole, keeping the hole cylindrical
Enough peg dope (wax, clay or soap) for even rotation
The curve should exactly match the transition between the pegbox and the string's path to the bridge, with no kinks in the string
The notch should be somewhat wide and open on the pegbox side, and exactly string-shaped on the fingerboard side
It must sit exactly on its feet with no gaps. Any gap sends vibration into flexing ankles instead of into sound
Shape matters enormously: thin along the top edge, curving through the middle, flat along the edges. That combination gives bite, tonal range and dynamics
Too thick sounds dead with little dynamics; too thin or flat sounds harp-like
Position: under the rightmost bridge foot, edge about 3.5 mm toward the chinrest
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