One workspace. Credits when you need them.

Yes. Start by describing what the object is for and what it should look like. You do not need to decide every dimension in advance. Share important sizes or constraints, then inspect the generated geometry and refine the design as you go.

Include the purpose, overall dimensions, main features and any requirements that must be met. For example: “Make an 80 × 50 × 5 mm plate with four holes, each 4 mm in diameter. Place one hole near each corner, with its center 8 mm from each of the two adjacent edges.” Attach a photo or sketch if you have one. If some details are undecided, start with the intended use and the direction you have in mind.

Yes. Adjust the dimensional parameters provided for the model directly, or request structural and shape changes in chat. Parameters are values such as height, thickness and hole diameter that determine the geometry. Be specific, for example: “Increase the height by 10 mm” or “Add a cable hole in the side.” The parameters available for direct adjustment vary by model. Check related dimensions and connections after each change.

Yes. You can attach photos, sketches or drawing images as references. Include key dimensions, material thickness and hole positions alongside the shape you want. A single image does not establish exact size or hidden internal geometry, so describe any important requirements as well.

Yes. You can request a model made up of multiple parts. Describe what each part does, where parts meet, and which parts are fixed or moving. Inspect the individual shapes, placement and clearances, then refine the design. Placing parts together does not by itself verify assembly or real-world motion, so check fit and interference as well.

Point out what should change in the current model. Explain both the change and what should stay the same, for example: “The hole should be in the side, not the top” or “Keep the overall size and change only the wall thickness to 3 mm.” If several changes affect one another, request the most important ones first and inspect the updated geometry before continuing.

For projects with saved versions, you can inspect and restore earlier models from the version history. Restoring a past version saved on the server creates a new latest version based on that state and keeps the existing history. Records stored only on the current device, or those past their retention period, may not be available to restore.

Choose STEP to continue designing in CAD or share geometry with a manufacturer. STL is a common choice for importing a model into a 3D-printing slicer. The two formats represent the same model in different ways. STEP: A CAD exchange format based on ISO 10303 that describes solids and surfaces mathematically. It retains curves without breaking them into triangles, making it useful for inspecting geometry and continuing design work in another CAD tool. Depending on the specification and exporter, it can also carry assemblies, colors, materials, tolerances and PMI, but these are not present in every STEP file. STL: Describes the surface as a triangle mesh and is widely supported by 3D-printing slicers. Standard STL has no colors, materials, measurement units, sketches or design history. Check the units and model size after import. Both ASCII and Binary variants exist; Binary is usually smaller. Precision and file size: STL is not inherently low precision. Coarse meshes can make curves look faceted. Finer meshes reduce surface approximation error but increase file size and processing work. Whether STEP or STL is smaller depends on the geometry and export settings. Editing and history: STEP is useful for importing solid geometry for further CAD edits, but it does not restore the original sketches, feature tree or parameter history. STL can be edited as a mesh or converted to a solid, though changing precise dimensions and curves may require additional work. 3D printing: Import STL into a slicer, set orientation, supports and process settings, then generate the printer file. Some slicers import STEP and triangulate it internally, so a separate STEP-to-STL conversion is not always necessary. When exporting a mesh yourself, use the available surface deviation (chord height) and angle tolerance settings to balance surface quality and file size. In CADlingo, Free includes STL export and STEP for 3 different versions a month; Starter, Pro and eligible existing paid plans include STEP without a monthly limit. Keep STEP for further CAD design, and choose a printing format supported by your slicer.

Before fabrication, check dimensions, wall thickness, holes and clearances between parts. For 3D printing, review orientation, supports and material settings. For machining, review tolerances and tool access. A small test print can help check the fit of mating parts. Use generated models after reviewing them against your fabrication requirements.

Projects are private by default on every plan and are not automatically published to other users. Model generation uses external AI services to process the descriptions and reference material you provide. The current Terms of Service allow generated data to be used in anonymized form for service improvement and quality enhancement. Project visibility and data processing are separate matters. See the Terms of Service and Privacy Policy for details.

Yes. Under the current Terms of Service, intellectual property rights in CAD models generated through the service belong to the user who created them, and models can be used for work or commercial product design. Check that you have permission to use any reference images, drawings or designs, and respect third-party rights. Before manufacturing or selling a product, review the design and fabrication requirements for its intended use. See the Terms of Service for details.

Starter includes 300 credits a month and Pro includes 1,200. 300 credits cover up to 30 new models, or a mix of models and AI edits. Monthly credits refill on each billing date and unused ones do not roll over; they are used before your other credits. A new model costs 10 credits. An AI edit uses 2–8 credits depending on how much work the change takes, charged only when the edited model is delivered. Parameter edits are free, and failed generations are not charged.

Free projects are stored for 7 days. Projects saved while on a paid plan have no storage time limit and remain saved after cancellation. New projects created after your paid access ends follow Free limits.

Yes. Cancel from your account page. Paid benefits and that period's monthly credits continue until your paid period ends. Your saved paid projects and credit pack credits remain; new work then follows Free limits.

For subscriptions and credit packs, you can request a refund within 14 days of payment for any reason. We refund the share of the payment matching its unused credits, and the full amount if none were used. Usage is counted against monthly credits first, then free credits, then credit packs. Duplicate charges and service outages are reviewed separately. See the refund policy for full details.

Contact us with your expected usage and any security or support requirements. We’ll help you understand the available options and terms.