Spec Case: Custom-Size 3D Printable Case Generator

Most cases are sized for someone else’s gear. Spec Case is sized for yours. Enter the internal length, width, depth, and lid depth below and the generator builds a latching, gasketed case to those dimensions. Download the STL and print it yourself, or contact us and we’ll print it for you and fill it with custom cut or pluckable foam.

Every Spec Case comes from the same parametric model, so any size you enter prints with the same design and the same results. We engineered the latches and hinges with finite element analysis to keep stress below the yield point, even in PLA, so they stay tight instead of loosening with use. The result is a firm, positive closing action you can feel every time.

Why We Built Spec Case

Off-the-shelf cases come in a handful of sizes, and your gear rarely matches any of them. You end up with a case that is too big and rattles, or one that is slightly too small and doesn’t close. Spec Case fixes that by sizing the case to the contents instead of the other way around. We developed it for our own product packaging, then opened it up because the same problem applies to almost anything worth protecting.

How It Works

1. Size it: Enter the internal length, width, depth, and lid depth. The generator builds the box around those numbers.

2. Fill it: Choose custom cut foam, pluckable foam, or no foam.

3. Get it: Download the STL and print it yourself, or contact us and we’ll print it.

Foam Options

Custom cut: We cut foam to the outline of your gear. See the photo requirements below. When you order custom cut foam, lid depth is set to match our stock foam thickness (12 mm).

Pluckable: Pre-scored foam you pull apart by hand to fit your items.

None: The box on its own. Bring your own inserts, or use it as a sealed utility case.

Photo Requirements for Custom Cut Foam

If you want custom cut foam, send us a photo of everything laid out exactly as you want it to sit in the box, with space between items. Include a ruler in frame for scale, the thickness of the thickest part of your thickest item, and shoot the photo straight on, orthogonal to the surface, so nothing is distorted.

Key Features:

• Parametric sizing: Internal length, width, depth, and lid depth set by you, so the case fits the contents

• Yield-safe design: Latches and hinges analyzed with FEA to stay in the elastic range, so even PLA prints keep their tension

• Tactile closure: Firm “clunk” on closing, smooth hinge motion, and a positive feel in both open and closed latch positions

• TPU gasket: Flexible gasket seals the lid against dust and moisture

• Rigid shell: Rigid outer structure with foam or crush elements protecting the contents

• Swappable interior: Remove and replace the foam to repurpose the case for new gear

• Print it yourself or order it: Free STL download, or we print it in-house

What We’re Considering Next

We’re looking at a tool that takes your photo, lets you mark two points on the ruler and enter the distance between them to set the scale, then asks for the maximum object thickness. From that it would size the box, design the foam cut, and price the whole order. You’d pay, and we’d make exactly what you ordered.

This is an idea, not a feature yet. If you’d use it, or have thoughts on how it should work, contact us and tell us what you’d want from it.

Get Started

Enter your dimensions above and download the STL, or contact us with your dimensions and foam choice if you’d like us to print and fill it for you. Have a tricky piece of gear? Send us the details and we’ll tell you what’s possible.