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), OBJ (.obj), and GLTF (.gltf, .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 build volume limit is 150mm × 150mm × 150mm. Parts exceeding this size cannot be manufactured as a single piece and may need to be redesigned or split into assemblies.
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) Wide range of castable 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 support a variety of alloys suitable for investment casting. Check our Materials page for the current list of available materials, their properties, and typical applications.
Can you cast stainless steel or high-temperature alloys?
Yes, investment casting is well-suited for stainless steels, tool steels, and various high-temperature alloys. Contact us to discuss specific alloy requirements for your application.
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?
Standard tolerances are ±0.13mm (±0.005") for the first 25mm, plus ±0.05mm per additional 25mm. Tighter tolerances can be achieved through secondary machining operations.
What is the minimum wall thickness?
Minimum wall thickness is typically 0.5-0.75mm depending on the material and part geometry. Recommended wall thickness is 0.75-6mm for optimal casting results.
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.
Still have questions?
Can't find the answer you're looking for? Our team is here to help.
Contact Support →