Support
Frequently Asked Questions
Answers to common questions about investment casting, quotes, materials, and production.
Getting Started
What file formats do you accept?
We accept STEP (.step, .stp), GLTF (.gltf), and GLB (.glb) file formats. STEP files are recommended for the most accurate geometry representation and pricing.
How quickly can I get a quote?
Quotes are generated instantly when you upload your 3D model. Our system automatically analyzes your part geometry, calculates pricing, and provides DFM feedback in real-time.
What is the maximum part size?
Our maximum part envelope is 300mm × 195mm × 290mm — your part must fit within it in at least one orientation. We recommend keeping every axis at or below 195mm. Larger parts cannot be cast as a single piece and may need to be redesigned or split into assemblies.
What is the minimum part size?
The smallest part we can cast is 30mm in its longest dimension. A part whose entire bounding box fits inside a 30mm cube is too small to gate and pour on its own — thin parts are fine as long as one dimension reaches 30mm.
Investment Casting Process
What is investment casting?
Investment casting (also called lost-wax casting) is a precision manufacturing process that produces near-net-shape metal parts with excellent surface finish and tight tolerances. The process uses a wax pattern surrounded by a ceramic shell, which is then melted away and replaced with molten metal.
What are the advantages of investment casting?
Investment casting offers: (1) Complex geometries including undercuts with no draft angles required, (2) Excellent as-cast surface finish (Ra 3.2μm typical), (3) Tight dimensional tolerances, (4) production-grade parts in our supported casting alloys, (5) Near-net-shape parts requiring minimal machining.
How does investment casting compare to die casting or CNC machining?
Unlike die casting, investment casting requires no draft angles and supports undercuts. Compared to CNC machining, investment casting is more cost-effective for complex geometries and can produce shapes that would be difficult or impossible to machine. The process also has less material waste than subtractive manufacturing.
Materials & Properties
What materials do you offer?
We currently offer A356 Aluminum Alloy and 316L Stainless Steel for investment casting. Check our Materials page for the current active list, properties, and typical applications.
Can you cast stainless steel or aluminum?
Yes. Our active casting materials are A356 Aluminum Alloy and 316L Stainless Steel. Contact us if your application needs help choosing between them.
How do I choose the right material?
Material selection depends on your application requirements including mechanical properties, operating environment, temperature resistance, and corrosion resistance. Our team can help you select the optimal material - contact us at connor@digitalmetal.io.
Design & Tolerances
What tolerances can investment casting achieve?
As-cast tolerance is ±1mm per 15mm of as-cast profile — so a 30mm feature holds ±2mm. The DFM review on each part shows the tolerance for its dimensions. Tighter tolerances can be achieved through secondary machining operations.
What is the minimum wall thickness?
Every wall must be at least 2mm thick. Our automated DFM check rejects walls under 2mm — thinner sections short-fill or cold-shut during the pour.
Do I need draft angles in my design?
No! Unlike die casting or injection molding, investment casting does not require draft angles. The ceramic shell is broken away from the part, allowing for vertical walls, undercuts, and complex geometries.
Can you cast threads or do they need to be machined?
While some coarse threads can be cast, fine threads and critical threaded features are typically machined after casting for better accuracy and surface finish.
Pricing & Orders
How is pricing calculated?
Pricing is based on part geometry (volume and surface area), material selection, quantity, and any post-processing requirements. Our shell-based pricing model accounts for material costs, shell/mold costs, labor, and business margins.
Are there minimum order quantities?
We accommodate both prototype and production quantities. While there is a minimum order charge, you can order as few as 1 part for prototyping.
What payment methods do you accept?
We process payments securely through Stripe. All major credit cards and payment methods supported by Stripe are accepted.
Lead Time & Shipping
What is the typical lead time?
Lead time varies based on part complexity, material, quantity, and current production schedule. Our system provides estimated lead times during the quote process. Contact us for specific timeline requirements.
Do you ship internationally?
Shipping options and availability are shown during checkout. Contact us at connor@digitalmetal.io for international shipping quotes or special requirements.
Quality & Post-Processing
What surface finish can I expect?
Investment casting typically achieves Ra 3.2μm (125 microinches) as-cast surface finish. Additional finishing options including polishing, bead blasting, and coating are available.
What post-processing options are available?
We offer heat treatment, machining, surface finishing, and various coating options. See our Post-Processing page for detailed information on available services.
How do you ensure quality?
All parts undergo dimensional inspection and visual quality checks. We can provide inspection reports and certifications upon request.
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