Quick answer: Suppliers need one controlled product definition: native or neutral 3D geometry, a 2D drawing for tolerances and notes, units, datums, exact material or requirements, surface and color, CTQs, assembly references, volume, validation needs and a clear revision/change record.
Release Decision Matrix
| Package item | Purpose | Frequent failure |
|---|---|---|
| 3D CAD | Defines nominal product geometry | Multiple conflicting models or damaged translation |
| 2D drawing | Defines datums, tolerances, notes and CTQs | Every dimension tight or important notes hidden in email |
| Requirement files | Material, appearance, assembly, tests and volume | Brand names without grade or undefined cosmetic language |
| Revision log | Explains what changed and why | New file name with no controlled impact review |
Approval Checklist
- Identify master native and neutral 3D files with units and revision.
- Validate solid geometry, configurations, orientation and translation.
- Provide 2D datums, tolerances, CTQs and measurement conditions.
- Specify exact resin, color, additives and substitution authority.
- Map surface, texture, gate, ejector and parting restrictions.
- Include mating parts, hardware, loads and functional tests.
- State volume, tool life, machine, validation and ownership scope.
- Use transmittals and return approved DFM changes to controlled CAD.
Provide a Clean 3D Master
Identify the master native format and include a stable neutral format such as STEP when useful. Confirm units, coordinate system, part orientation and whether shrinkage is absent from product CAD. Check solid integrity, duplicate bodies, tiny gaps and unintended surfaces before release.
Name files with part number and revision. Do not send several alternatives without a status. Suppressed features, configuration tables and linked components should resolve for the receiving team.
Use the Drawing for Manufacturing Requirements
Define functional datums and tolerances that reflect assembly and use. Mark CTQs and inspection expectations. Include threads, inserts, textures, color, gate or ejector restrictions and parting-line acceptance where needed.
Avoid overdimensioning flexible geometry or duplicating dimensions that conflict with 3D. State general tolerance standard and exceptions. Define measurement timing and conditioning for moisture- or temperature-sensitive plastics.
Specify Material and Surface Completely
Provide exact approved grade, color and additives or a requirement matrix with approval authority. Include filler, flame, UV, recycled-content, food-contact or other evidence expectations. A polymer acronym alone is insufficient for final tooling decisions.
Map Class-A, secondary, hidden, sealing and sliding surfaces. Use physical color, gloss or texture references and viewing conditions when appearance matters. Clarify whether supplier substitutions require written approval.
Include Assembly and Product Context
Supply mating CAD, hardware, stack-up, load path and functional tests for critical interfaces. Identify screw, snap, insert, weld, seal or adhesive processes. The mold supplier needs to understand why a dimension matters to propose useful DFM.
State environment, cleaning chemicals, service temperature, impact, UV, moisture and life expectations. Protect confidential information through the agreed commercial process while providing enough engineering context.
Add Program and Validation Requirements
Include annual and peak volume, launch timing, cavities, tool-life expectation, target plant or machine, automation, packaging and export standards. Define tooling ownership, design-review gates, T1 quantity, dimensional report, material certificates, trial data and acceptance route.
Comparable quotations require consistent scope. Separate mandatory requirements from options and future variants. Identify customer-supplied components and responsibility for gauges or testing.
Control Revisions and DFM Changes
Use a transmittal listing each file, revision and status. When CAD changes, provide a change note or geometry comparison and assess mold, process, validation and inventory effects. Do not let an annotated screenshot become the only product definition.
Return approved DFM actions to the controlled CAD and drawing. Freeze a steel-release package and keep later changes traceable. Email CAD to the designated project contact instead of relying on unsupported public upload links.
Illustrative CAD Handoff
Illustrative engineering example—not a claimed CKMOLD customer result: A supplier receives two STEP files and a screenshot calling one dimension critical. The buyer replaces them with one revisioned model, a drawing with datum scheme and tolerance, mating-part geometry, exact resin and a change log. DFM then evaluates the functional stack instead of guessing which file is current.
Supporting Review Resources
Questions Before Approval
Is a STEP file enough for an injection mold quote?
It can support an early quote, but reliable scope usually also needs material, volume, tolerances, CTQs, finish, assembly and validation requirements.
Should shrinkage be built into product CAD?
Normally product CAD represents nominal part geometry; the mold team applies and validates shrinkage in tooling data under the agreed workflow.
Why provide both 3D and 2D?
3D defines nominal geometry, while 2D can control datums, tolerances, notes, CTQs and acceptance that geometry alone does not express.
How should CAD files be sent to CKMOLD?
Send project details through the quote form and email CAD files directly to jerry@ckmold.com with part number and revision.
Apply the CAD Release Package for Injection Molding review to your released design. Share the function, exact resin, annual volume, CTQs, cosmetic limits and launch timing through the CKMOLD project form. If CAD is relevant, send it directly to jerry@ckmold.com; the form does not require an upload.