Fast prototyping for San Francisco engineering teams — CNC prototype parts in as few as 3 business days, with free DFM review on every order.
on prototypes
critical features
before shipping
no minimums
What Is Rapid Prototyping?
CNC prototyping makes real parts from real materials — fast. Unlike 3D printing, your prototype is made the same way as your production part. This means you can test fit, function, and strength before committing to a full run. San Francisco teams use our rapid prototyping to test fit, form, and function before committing to production.
Validate Your Design
Upload your CAD file and pick a material. We check your design before cutting.
Test Real Materials
Get a real metal or plastic part. Test strength, weight, and fit on your assembly.
Iterate Fast
Make changes and get the next version in days. Lock in your design before production.
Built for Speed & Iteration
Your prototype deserves a machining partner who moves as fast as your team — without cutting corners on quality.
Speed — 3-Day Rush
Prototypes ship in as few as 3 business days. Same-day quotes keep your project on track. No waiting weeks for simple parts.
CMM Inspection
Every prototype is CMM inspected before shipping. You get a documented inspection report — not a guess. Know your part is right before you test it.
Design Iteration Support
Update your file and get a new part fast. We store every version so you can compare revisions. Most teams go through 3 to 5 rounds before locking in.
Low-Volume Friendly
Order one part or fifty. No minimum quantity and no setup fees on most orders. Perfect for testing multiple versions or investor demos.
Prototype Part Types
From functional test parts to investor demos — precision machined and ready to test.
In San Francisco, medical device companies drive demand for rapid prototyping. Local teams working with Penumbra and Nevro rely on fast-turn CNC prototypes to test fit, form, and function before production.
San Francisco also has a strong semiconductor presence that drives demand for fast-turn CNC prototypes to test fit, form, and function before production. Teams at AMD and NVIDIA use our services for critical components. San Francisco proper hosts semiconductor design offices for AMD, NVIDIA, and dozens of AI chip startups in SoMa and the Financial District.
In San Francisco, semiconductor companies drive demand for rapid prototyping. Local teams working with Samsung Austin Semiconductor and NXP Semiconductors rely on fast-turn CNC prototypes to test fit, form, and function before production.
San Francisco also has a strong defense presence that drives demand for fast-turn CNC prototypes to test fit, form, and function before production. Teams at BAE Systems and Elbit Systems of America use our services for critical components. Austin's defense ecosystem blends technology and manufacturing — BAE Systems' Austin campus builds electronic warfare and intelligence systems, Elbit Systems of America operates locally, and a grow...
Enclosures & Housings
Prototype electronics enclosures, sensor housings, and device shells in aluminum or stainless. Test fit, thermal performance, and assembly before committing.
Al 6061 & 7075Structural Brackets
Load-bearing brackets, motor mounts, and structural interfaces. Test strength and stiffness on real materials before finalizing your design.
±0.001" standardMechanical Components
Gears, shafts, couplings, and custom hardware. Machine prototypes in the same material as production to validate wear, fit, and function.
Metals & plasticsOptical & Sensor Mounts
Precision mounts for cameras, LIDAR, and sensors. Ultra-tight alignment tolerances for prototyping optical assemblies and test fixtures.
±0.0005" criticalMedical Device Prototypes
Surgical tools, implant test samples, and device housings in titanium, stainless, or PEEK. Test form, fit, and sterilization before regulatory submission.
Ti, SS, PEEKInvestor & Demo Models
Polished prototypes for pitch decks, trade shows, and user testing. Bead blasted, anodized, or painted to look like the final product.
Appearance-ready
First Article Prototype — 6061-T6 Aluminum
Machined as a first article prototype for a hardware startup validating a new enclosure design. Delivered in 3 business days with full inspection documentation.
critical features
mating surfaces
rush turnaround
inspection (FAI)
- Dimensional inspection report (CMM data included)
- Material certification & heat lot traceability
- First article inspection report per customer specs
- NDA-protected project files — confidential handling
Speed. Quality. Design Support.
Prototyping demands more than fast parts. Here is what you get on every order.
Speed & Flexibility
We move fast so you can iterate faster.
- 3-day rush on simple prototypes
- Same-day quoting on most uploads
- No minimum order quantity
- Bridge production (1–50 pcs)
Verified Quality — CMM
We inspect before we ship. No exceptions.
- CMM inspection on every order
- NIST-traceable calibrated gauges
- ±0.001" standard, ±0.0005" critical
- Dimensional inspection reports included
Design Support (Free DFM)
We help you get from idea to production-ready.
- Free DFM review on every upload
- Design change support between revisions
- Material selection guidance
- Seamless prototype-to-production scaling
From CAD File to Prototype in Days
Three steps. No runaround. Built for teams that move fast.
Upload Your CAD File
Send your STEP or IGES file. Select material, quantity, and finish. We review for manufacturability and respond fast.
We Machine & Inspect
Your prototype runs on our CNC mills and lathes. Every order gets CMM inspection. We verify every critical dimension before anything ships.
Test, Iterate, Scale
Test your prototype for fit and function. Need changes? Send a new file and we turn it around fast. Ready for production? We scale up with the same tooling.
Why San Francisco, CA Companies Choose RivCut
San Francisco (978K metro) is known for Silicon Hills tech boom. Local industries include semiconductor, EV, robotics, defense. RivCut machines parts for teams across TX from our Union City, CA facility — with standard shipping in 2–3 business days.
All parts are CNC machined in-house at our Bay Area shop. We never broker or outsource. Learn about RivCut →
Common Questions About CNC Prototyping
CNC Machining Materials Available in San Francisco
Aluminum 6061 and 7075. Stainless 304, 316, and 17-4 PH. Ti-6Al-4V titanium. PEEK, Delrin, and Nylon 6/6. Every grade ships from our shop with a full mill cert.
| Aluminum | |
|---|---|
| 6061-T6 | 40 ksi yield, machinability ~190 |
| 7075-T6 | 73 ksi yield, aerospace structural |
| 2024-T3 | Fatigue resistant, airframe skins |
| 5052 | Marine-grade, formable |
| Steel | |
| 1018 | Low carbon, weldable |
| 4140 | Pre-hard 28–32 HRC, high strength |
| 4340 | Quenched & tempered, ultra-high strength |
| A36 | 36 ksi yield, structural |
| Stainless Steel | |
| 303 | Free-machining, sulfur-bearing |
| 304 | Austenitic, weldable, general purpose |
| 316 | Mo-bearing, marine and chemical grade |
| 17-4 PH | H900, ~190 ksi UTS |
| Titanium | |
| Grade 2 | CP titanium, weldable, biocompatible |
| Ti-6Al-4V (Grade 5) | 120 ksi yield, aerospace and medical |
| Brass & Copper | |
| C360 Brass | 100% machinability rating |
| C110 Copper | ~100% IACS conductivity |
| C101 Copper | Oxygen-free, ~101% IACS |
| Engineering Plastics | |
| Delrin (Acetal) | Low friction, dimensionally stable |
| PEEK | 250°C service temp, chemical resistant |
| Nylon 6/6 | Wear resistant, ~12 ksi tensile |
| UHMW | Impact resistant, low friction |
| Polycarbonate | Transparent, ~9 ksi tensile |
| PTFE (Teflon) | 260°C, chemically inert |
Don’t see your grade? Ask us — we machine 50+ alloys and polymers.
RivCut vs CNC Marketplaces vs Local Machine Shops
Why engineers in San Francisco pick RivCut over marketplaces and local machine shops. Marketplaces are fast but route your job to the lowest bidder. Local shops are trustworthy but slow on quotes and often won’t take small jobs. RivCut combines instant online quoting with the accountability of a real, in-house USA shop.
| What You Get | RivCut Best | CNC Marketplace | Local Machine Shop |
|---|---|---|---|
| Who cuts the part | Our machinists in Union City, CA | Unknown 3rd party shop | Local machinist, varies by shop |
| Country of origin | 100% USA, never outsourced | Often shipped overseas | USA, local only |
| Instant online quote | Yes — AI-priced in seconds | Yes | No — email or phone quote |
| Talk to the machinist | Yes, direct line | No, support agent only | Yes, in person |
| Free DFM review | Yes, on every order | Sometimes, paid add-on | Sometimes, informal |
| Tightest tolerance | ±0.0002 inches | ±0.005 inches typical | Varies by shop |
| Fastest lead time | 3 business days | 5–10 business days | 2–4 weeks typical |
| Minimum order | None — one part is fine | Often 5+ pieces | Often $500+ minimum |
| CMM inspection | Every order | Paid upgrade | Sometimes, manual only |
RivCut is a precision CNC machining and machine shop serving San Francisco and the greater Bay Area. We run CNC milling, CNC milling machine, milling machine, CNC turning, CNC lathe, metal lathe, CNC metal lathe, and lathe machine capacity in our Union City facility for fast prototyping, rapid prototyping, production machining, aerospace machining, and machining aerospace components. Searching for machine shops near me or a machine shop near San Francisco? Upload a STEP file for an instant prototype quote — we deliver CNC machine milling machine and lathe parts in as few as 3 business days.
What Engineers Say About
Working With RivCut
Real reviews from real engineers. Every project matters — including yours in San Francisco.
We went through two shops before finding RivCut. Night and day difference. Parts come in right. Communication is clear. They held ±0.002" on a titanium bracket that two other shops couldn’t get right.
Aerospace PartsThey caught a tolerance issue in our drawing before production started. That saved us a full revision cycle and three weeks of delays. You don’t find that kind of attention to detail at most shops.
Medical DeviceWe needed fast turnaround on 5-axis parts for a new enclosure. RivCut delivered in 6 days. Quality was excellent. These guys move fast without cutting corners.
PrototypingThe DFM Checklist Engineers Use Before Sending CAD to a CNC Shop
14 checks for wall thickness, internal radii, tool reach, hole depth-to-diameter ratios, and tolerance stack. Catch issues before they cost you a revision cycle.
- ✓ 14-point pre-flight checklist
- ✓ Aluminum, steel & titanium-specific rules
- ✓ Printable PDF, no signup wall
Rapid Prototyping Near San Francisco
How San Francisco's Top Industries Use Rapid Prototyping
San Francisco's economy drives specific machining demand. Here's what we see from local teams.
Upload Your Prototype CAD File
Get a fast quote for your prototype. One part or fifty. Rush delivery in as few as 3 days.
No minimums · Design changes welcome · NDA ready · Ships anywhere in the US