How to choose the size of your piece

What "longest side" means

You set the size of your piece with one number: its longest side, in millimeters (mm). Picture your piece lying flat in front of you. The longest side is the biggest measurement across it, whether that's top to bottom or side to side.

The other dimensions scale to match, so your design keeps the same shape. For example, if you enter 20 mm for a pendant, it might come out at 20 × 16 × 1.8 mm. You'll see the full dimensions right next to the size you enter.

How to measure

The easiest way to choose a size is to measure something similar you already own.

Find an item close to what you want to create, like a pendant, a button or a coin.
Lay it flat and measure its longest side with a ruler or tape measure in millimeters.
Enter that number as your longest side.

If your ruler only shows inches, multiply by 25.4 to get millimeters. For example, 1 inch is 25.4 mm.

Not sure where to start? A US quarter is about 24 mm across, and a standard credit card is about 86 mm on its long side.

How size affects your price

Your price is based on how much material your piece uses, at today's material prices. Because your piece grows in every direction at once, size has a big effect on price. A piece twice as long uses roughly eight times the material.

If the price is higher than you expected, try a slightly smaller size. You can change your size and see the updated price in production before you order.

Common sizes

Use these as a starting point. Every design is different, so choose what looks right for yours.

Category	Item type	Common longest side
Jewelry	Necklace pendant	15–40 mm
Jewelry	Earring	15–40 mm
Jewelry	Ring	18–25 mm
Jewelry	Bracelet	55–70 mm
Fashion Hardware	Fashion hardware (general)	20–60 mm
Fashion Hardware	Button	15–30 mm
Fashion Hardware	Zipper pull	25–45 mm
Fashion Hardware	Belt buckle	50–80 mm
Fashion Hardware	Stopper	15–30 mm
Home Decor	Decorative pull	100–160 mm
Home Decor	Drawer pull	100–200 mm
Home Decor	Switch plate cover	110–120 mm
Home Decor	Desk object	50–120 mm
Home Decor	Small sculpture	75–150 mm
Collectibles	Coin	25–45 mm
Collectibles	Token	20–35 mm
Collectibles	Medallion	50–75 mm
Collectibles	Small figurine	50–100 mm

For rings, the longest side is the outer width of the ring, not your ring size.

Very small pieces

If any dimension of your piece is under 0.8 mm, you'll see a caution message. Very thin details may not produce with good quality. You can still place your order, but please double-check your size first. Orders that aren't optimized for production may be subject to a 15% restocking fee.

Changing your size

You can change your size at any time before you order.

In production, find the Size & Price panel.
Enter a new longest side. The full dimensions update as you type.
Click Apply to update your price.

If you started from a template, your piece begins at that template's standard size, and you can adjust it the same way.

Saving sizes

With Premium, you can save the sizes you like to your Model Library. Click Save size in the Size & Price panel, and that size will be ready to reorder next time you open the model. This is handy if you create the same piece in several sizes.

Frequently asked questions

Why doesn't the 3D preview change when I change the size? The preview shows the shape of your design, not its real size. The size you enter is the size we produce.

Can I set the width and height separately? Not at the moment. Your piece scales evenly so its proportions stay exactly as designed.

Will my design look the same at a smaller size? Yes, the shape stays the same. Very fine details may soften at small sizes, which is why we show a caution for pieces under 0.8 mm.

Can I change my size after ordering? Please contact our team as soon as possible if you need to change an order.