moldy/by VASE 3D Open Moldy

Your next collection, designed and molded.

Design in VASE 3D or bring an STL, OBJ, 3MF, PLY or GLB file. Moldy makes the parts you 3D-print to pour your own silicone or plaster mold.

Open Moldy, free Design in VASE 3D

The mold kit Moldy makes for the Diamond Point urn at 170 mm, with 3 mm silicone. A 3D render of the real files; not poured yet.4 parts to print · case 175 × 113 × 218 mm

One urn, three steps.

  1. The Diamond Point urn in a deep red glaze: an eight-sided foot, a body covered in diamond points and a tall eight-sided neck

    Design

    The Diamond Point urn, designed in VASE 3D.

  2. The same urn as a plain white solid, with the pour funnel flaring above its neck

    Export

    VASE 3D saves the urn as a 3D file. Its funnel becomes the pour hole.

  3. The kit cut open: the printed case, then a green layer that shows the space the silicone fills, then the printed copy of the urn with its diamond points

    Print and pour

    Moldy makes the two case halves and a printed copy of the urn. The green shows the space the silicone fills; poured, it sets into one silicone mold, held in the two-part case.

What Moldy checked on this urn’s kit

On screen, for the urn made 170 mm tall.

  • 4parts to print, each a closed solid
  • 0 mm³where the two case halves meet
  • 154,089checks per case half: each lifts straight off, none blocked
  • 256 mmall 4 parts fit one 256 × 256 mm print bed; the tallest stands 218 mm
  • 105 mlabout this much silicone fills the mold, measured from the files

Only a print can tell

How tightly the halves fit, how well the clips hold, whether the seam seals, how easily the silicone lets go, and how strong the parts are.

Moldy makes clay tools too.

Hump and press molds, jiggers and extruder dies from your 3D file, and texture rollers and sprig molds from a pattern you pick. Free. For slip-casting, Moldy also makes plaster molds of two halves and a base, with a printed case to pour each part in, for pieces that are round all the way round.

What’s free and what you pay for.

$29a month for this urn’s Maker patterns in VASE 3D, 7 days free$0its mold, made in Moldy today

You buy the silicone, filament and clips. Prices as of 14 October 2026.

moldy/makes the molds

The 4 printed parts of the urn’s free kit side by side: two case halves, each carrying the shape of the urn’s diamond points, the printed copy of the urn, and the small holder
The urn’s mold kit$0Free to use. The free kit: 4 parts to print (STL), a ready-laid print plate (3MF), a print sheet (PDF), written step-by-step instructions, and every setting and check.

VASE 3Ddesigns the pieces

An eight-sided fluted bowl in a pale green celadon glaze
Free$0Vases and bowls without lids, with 19 shape and surface patterns. Save up to 25 designs.
A tall fluted bottle in a glossy black glaze, its lid set down beside it
Maker$29a month, 7 days freeAdds lids and 67 more patterns. Save up to 150 designs.
A deep red cut-glass cup on an eight-sided foot, with a handle
Foundry$79a month, 7 days freeEverything in Maker, plus handles. Save up to 400 designs.

Make a mold for your piece.

Moldy checks your piece first. If it can’t plan a mold for it, Moldy tells you why and shows where it catches, before you print anything.

Open Moldy or design a piece in VASE 3D

Or try it with this urn: download its 3D file (2 MB), open Moldy, set the height to 170 mm, pick Silicone mold, and tap “Use 3 mm silicone” if asked.

Opens
STL, OBJ, 3MF, PLY or GLB, up to 256 MB, including VASE 3D files. For other files, you place the pour hole.
You get
One download: the parts to print (STL), a print plate (3MF), a print sheet, written step-by-step instructions, the settings and checks, your file and its sized copy.
Runs
In your web browser. Your file stays on your computer.
Account
None needed today, to use Moldy or to download a kit. You tick a short safety note first.
Size
Made for your printer’s bed (256 mm unless you change it). If a part is too big, Moldy offers to shrink the piece to fit.
Before you pour
Moldy tells you to soap a print before plaster, and to seal resin prints before platinum silicone, which they can stop from curing.
Layer lines
They show in the cast. Print the copy at fine layers (Moldy suggests 0.12 mm) or smooth it first.
Food
Printed parts are not food-safe. For food, pour a food-grade silicone mold from them and follow the silicone maker’s instructions.

The pictures are 3D renders of the files Moldy and VASE 3D made. Moldy checks each mold on screen, not with a real pour, and does not test how the silicone comes off your piece. Print a small test before your first full pour. Any silicone or plaster amounts are estimates.