Learn more about our materials, finishing services and production options.

  1. Overview
  2. Additive
  3. Cast
  4. CNC
  5. Injection
  6. Materials


A strong, tough, and cost-effective material, machined ABS is even stronger than the 3D printed version in addition to being more consistent in its properties. ABS is the second toughest nonmetallic material Fast Radius offers, more than four times tougher polycarbonate. ABS is suitable for mounts, cases, soap holders, gears, and a wide variety of other projects with moderate to high strength and toughness requirements.


Stronger than ABS, yet more brittle, Polycarbonate is the material of choice where shock loads are less likely than constant loads and more strength is required than ABS provides. Polycarbonate is also transparent to RF radiation, making it ideal for antenna covers, containers, and a variety of structural components.

Polycarbonate 20% GF

For projects which need to increase strength even further, glass polycarbonate composites are an option. At double the strength, three times the modulus, and a notably higher impact resistance, this material is ideal for thin walled structures, structural components, and any other application where more strength and rigidity is needed.

Nylon 6/6

With a high surface hardness, high temperature tolerance, and better strength than Polycarbonate (but lower toughness), Nylon 6/6 is the next step in trading impact resistance for static strength. This is the material of choice when a high melting point plastic is required and scratch resistance is still desired, or when strength and stiffness are key. Ideal use cases include thin cosmetic covers or underhood components.

30% GF Nylon

For increased strength and heat resistance, glass reinforced Nylon is also available. This is the weakest of the composites, but still stronger than any plastic besides the ULTEMs, and it is even more resistant to heat than pure nylon. This is the material of choice for underhood components and other applications which require the best strength possible while maintaining the temperature resistance of Nylon.


Like all Acetals, Delrin exhibits good temperature resistance along with exceptional lubricity, surface hardness, and abrasion resistance. It also exhibits better stiffness than polycarbonate; making it ideal for high performance engineering components such as gears, joints, and fasteners. As a result, it sees heavy use in the automotive industry.


High Density Polyethylene has a limited strength, but a high elongation to failure, strength to weight ratio, and toughness. It also possesses high chemical resistance, meaning it can be easily disinfected or used in contact with acids. Its low melting point and softness make it easy to machine, weld, and cast. As such, it’s ideal for mass produced containers in contact with both benign and highly acidic materials. It’s also commonly used for cutting boards, machined parts, and tank linings.


Similar in many ways to HDPE, Polypropylene is used in similar applications. However, Polypropylene has a higher melting point, allowing it to be used in microwaveable containers, and is able to withstand autoclaving conditions. It possesses high lubricity which prevents it from being glued effectively. Because of this, its relatively low melting point is leveraged to weld it instead. Combined with its high strength to weight ratio, fatigue resistance, and chemical inertness which it shares with HDPE, it sees use in reclosable containers, ropes, piping, and clothing.

Clear Acrylic

Acrylic exhibits strength similar to Nylon, but with lower toughness and a better surface hardness. It is also highly transparent, and can be used as a replacement for glass. In many cases, it serves as a more economical alternative to polycarbonate when toughness is not as critical or the presence of Bisphenol A could be an issue. Artwork, intraocular lenses, biomedical implants, and windshields are all applications for this material.

PVC White/Gray

Best known for its use in tubing, polyvinyl chloride is a cheap and versatile polymer valuable for its self-extinguishing properties, strength to weight ratio, and ease of manufacture. It is suitable for signage, siding, tubing, and other applications which require good toughness and chemical resistance.

PVC Clear

With better strength than Nylon and good stiffness and impact resistance, this is a cost effective option for low temperature high strength applications where the cost of composites isn’t justified, or transparency is needed. This material is suitable for containers, mechanical components, electronics cases, and similar applications.

Ultem 1000

With the highest strength and strength to weight ratio of the polymeric materials we offer, this is the material to choose when strength is the driving variable. Toughness is comparable to PVC and Nylon. When necessary, ULTEM 1000 will perform at temperatures over 400°F, making it suitable for underhood and aerospace applications.

Ultem 1000 20% GF

The second-strongest non-metallic material offered for CNC machining, glass reinforced ULTEM 1000 is more than three times as strong as ABS and twice as strong as Nylon, while offering toughness similar to Polycarbonate. This material is ideal for aerospace and underhood components, as well as frames, structures, and other load bearing parts.

G-10 FR4

The strongest non-metallic material offered for CNC machining, this glass-reinforced epoxy offers more than twice the strength of reinforced ULTEM 1000 and the highest nonmetallic toughness to boot; not even ABS can resist impacts as well. This material is suitable for high-performance parts in the aerospace and automotive industries.

Aluminum / 6061-T651

A widely available structural metal with fairly good strength, excellent joinability, and resistance to corrosion. Used for aircraft and marine fittings, valves, bike frames, and other parts where an excellent strength to weight ratio, resistance to corrosion, and joinability override the need for raw strength.

Aluminum / 7075-T651

A very high strength structural metal used for gears, keys, worm gears, aircraft frames, and other applications where very high strength, light weight, and corrosion resistance are required. Machinability suffers compared to 6061.

Brass / 260 (70/30)

For aesthetic, low friction, and spark-free applications, 260 Brass is available. Offering good durability, strength, and corrosion resistance, this material can be used for lamps, flashlight cases, locks, hinges, and tools in environments where sparks are unacceptable.

Copper / C101

C101 is very pure grade of copper, appropriate for applications where thermal and electrical conductivity are more important than strength. Due to it’s brilliant color, it is commonly found in decorative applications. Artwork, electrical components, marine parts, and valves are all applications that this material is appropriate for.

Low Carbon Steel / CR 1018

A common low carbon steel, CR 1018 is a mid-strength, highly ductile, general-purpose carbon steel good for gears, functional parts, frames, and almost any structural application where severe corrosion and weight budgets are absent.

Magnesium / AZ31

AZ31 is a low strength, low density Magnesium alloy for applications which require a good strength to weight ratio, specific modulus, and weldability. It is also highly corrosion resistant. Magnesium is the lightest of the structural metals, and is particularly useful when buckling is a concern. Its low density means parts made from AZ31 will be thicker in order to have the same strength as their aluminum counterparts. This material is appropriate for very light components such as camera frames, tripods, backpacking gear, and aerospace parts.

Stainless Steel / 304/304L

Type 304 stainless steel is a moderate strength, highly ductile, general purpose austenitic stainless steel suitable for gears, structural components, and other structural uses in moderately corrosive environments. 304L is a low carbon variant that can be welded as carbide precipitation is negligible. This is a nonmagnetic material and is commonly used in land based structures exposed to the elements.

Stainless Steel / 316/316L

Type 316 stainless steel is a modification on type 304 which includes Molybdenum to further increase corrosion resistance, especially to pitting. It also maintains its strength up to 600°F. It is suitable for fittings, structures, cables, and functional components used in moderate to aggressive corrosion environments, such as coastal and marine settings. 316L is a low carbon variant to limit carbide precipitation during welding. This is a nonmagnetic material.

Stainless Steel / 17-4 PH

A high strength martensitic steel for applications where more strength is needed and moderate corrosion threats are present. Its ductility is less than the austenitic steels, but weldability is excellent. This material sees heavy use in the aerospace, petrochemical, and food industries for structures, containers, and other types of parts.

Steel Alloy / 4140

4140 is a low alloy steel with high impact and abrasion resistance as well as toughness. It also has great fatigue strength and decent resistance to atmospheric corrosion. This makes 4140 suitable for structures, gears, chains, and functional components in mildly corrosive environments. It has good weldability, and maintains reasonable strength up to 600°F.