A STEP file in.
A printable mold out.

MoldAid reads your part and builds the mold: a thin shell in soluble resin, held in two frame blocks that separate at the parting surface. You get print-ready files — and the measurements behind every decision.

Try your own part See how

The analysis is free. You only pay when you download the files — and if the program rejects your part, you get the reason without paying for it.

The mold opened: frame A in blue, frame B in orange, and the finished part between them.

A-side B-side shell in soluble resin your part the melt

MoldAid built this mold for an example part. The machine is an illustration. The filling shows the simulated flow pattern, without promising a fill time.

Three steps

You decide, the machine calculates. Every number it shows is measured on your part — not looked up in a table.

The times below were measured on the mold at the top of the page. A larger part takes longer — this is a measurement, not a promise.

STEP 1

Upload part

Drag in your STEP file and choose part material. MoldAid measures wall thickness, finds undercuts, and suggests which direction to split the mold.

No payment, no obligation.

3 seconds for the part above

The uploaded demo part in 3D.
STEP 2

View advice and filling

The advisor suggests gates and vents and explains why. The flow check fills the part so you can see where the flow fronts meet and where the air ends up.

If the model says no, you get the reason — and how confident it is about it.

4-5 minutes for the part above

The flow front on the demo part, with the fill time legend.
STEP 3

Build and download

The mold is built: the shell, the two frames, guide pins, and vents. You get print-ready STL and STEP files plus the resin cost and print time.

This is where you pay — and only here.

49 seconds for the part above

The built demo mold with its A-side and B-side separated.

It finds the flaw before you print

MoldAid flags problems before you print. This example has a part that cannot pull free. The mold halves can close.

Found Draft angles and undercuts

The part cannot pull free in this direction. Change how the mold opens, or use a soluble shell that washes away around the part.

Holds A/B — can the mold close?

The two halves fit together and can close around the part.

See what needs attention before spending resin and print time.

Your mold, in 3D

The built demo mold with its A-side and B-side separated.
The mold opened
The finished flow check on the demo part, with the fill time legend.
The finished fill

What it can do — and what it cannot

A tool that promises too much costs you a mold instead of saving you one. So both sides are shown here.

  • ✓Shell + frame, full shell, or flange. Three architectures, horizontal or vertical parting, multiple cavities in the same mold.
  • ✓Measured, not guessed. Wall thickness, draft angles, undercuts, blocked faces, and air entrapments are measured on your geometry.
  • ✓Filling is simulated. Fill time, pressure, frozen layer fraction, and where the flow fronts meet.
  • ✓Print-ready files. STL and STEP, arranged for the build plate, with resin usage and print time.

It is a printed resin mold, not steel

It is for prototypes and small production runs. How many shots a mold lasts depends on the part, material, and machine — that number is not listed here because it cannot be predicted without knowing your part.

The program calculates using models, not measurements from your machine. That is why it tells you how uncertain a number is and when a verdict rests on an estimate rather than the geometry. If you have built the mold before and seen it hold up, your own measurement carries more weight.

Get started

Create an account, upload a part, and see what it says. The analysis is free.

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