JTB-II / Free CAD Files for an Original Guitar Model

The JTB-II is an original guitar model – it is being released here for personal use only. Re-sale or commercial production based on these models is prohibited.

OK, now that’s out of the way, we can get to the fun stuff. This is a model I’ve been working on here and there for some time. It has some inspiration taken from an Ibanez JEM model, but at this point, it’s hard to compare the two at this point.

The guitar underwent a number of changes before arriving at the model being supplied here. It’ll undergo more changes before it’s taken to production too. The model being supplied here was a variation that allows you to remain creative with your own build. There’s no inlays, no radius on the body’s edges, and no hardware or cavities. Essentially, it’s a bare-bones model.

Download the JTB-II CAD Files

JTB-II Guitar Model

CAD files available for download on GrabCAD

(File types: STL, Fusion 360, STEP)

Download

Specs

Scale: 25″ / 635mm
Frets: 24
Fretboard Radius: 12.8 in / 325 mm
Body 1 Depth: 1.272 in / 32.3 mm
Body 2 Depth: 0.118 in / 3 mm
Overall Body Depth: 1.39 in / 35.3 mm
Pickup Config: H-H

Neck Joint: Set
Neck Style: 1-piece, volute
Neck Pitch: 0°
Bridge: Hardtail (intended)
Headstock Pitch: 7°
Headstock 1 Depth: 0.51 in / 12.95 mm
Headstock 2 Depth: 0.059 in / 1.5 mm

~~Truss rod slot~~
~~Truss rod cover~~
~~Control cavity / cover~~
~~Wiring channels~~
~~Hardware drill points~~

Illustrator + Fusion Design Process

As usual, the entire design began in Adobe Illustrator:

The drawings are more detailed than the model supplied in some areas – and less so in others. The process of turning a drawing into a 3-dimensional model always presents new challenges. On top of this, it’s an original design so it’s never really finished in my mind.

The version made in Fusion 360 is based on the hardtail drawing:

The entire model was created using a process of extrusions and lofting, with some areas being softened with the filet tool. Apart from the cutaways, the body itself has no filet on the edge (radius, routed edge). This is to allow users to have enough solid wood to make their own unique changes to the model before routing.

It’s more common for complex models to be created with the sculpting process in Fusion (mesh editing), but I prefer standard extrusions. It can be very frustrating when you come to the neck heel or volute area, but with some creative sketch placements, you can loft and filet your way there.

For my own purposes, lofting just feels more natural – but I would encourage anyone to practice sculpting guitar models instead. It’s a tough thing to learn, but once you’ve got the hang of it, you’ll be capable of much more.

For anyone asking “where’s the JTB-I?” – this is the first incarnation:

The JTB-I is a bolt-on model, and has some unique features. While the body styles are very similar, the JTB-I is a slightly larger body that resembles an Ibanez JEM. In some respects. The volute is smaller, fretboard radius is flatter, scale is longer, and generally less imaginative. I wanted to do something more original with the second version.