Printing Materials
In this section we will discuss a number of materials that can be used with RepRap and the ways to use them, as well as the core information needed for their successful application. Many of these materials will fall under the Polymer class (loosely called plastics). In time we will also discuss clays, plasters, cements, gels, and any other materials we think can be of use.
Polymers
Thermoplastic
The term thermoplastics applies to polymers that reversibly change phase with temperature. While keeping within a boundary of temperatures, these phase changes can be done safely and the material returns to it's original solid state after cooling, without any alteration in it's original properties.
See also WorkingWithThermoplastic.
Thermoplastics Data Sheets and where to get them
These are the various suppliers we've found. YMMV.
A useful plastic with a very low melting point that is hand-workable. You can use it to fashion your own parts without a machine, Its a tad bit expensive, but very handy. Check out the link above for suppliers.
This is very common engineering plastic. It is used in a wide variety of consumer goods. It's strong, durable, and has a decent melting point. It's also very cheap. Unfortunately it has, compared to FDM-friendlier plastics, a very high shrinkage factor when solidifying, so there isn't much of a chance of it ending up being the main working material of choice for RepRap.
ABS is a general purpose, strong, and very resistant type of plastic. It is a bit more expensive than HDPE, but it also is a bit higher quality material than HDPE.
Polylactic acid is a cheap, biodegradable polymer, that is produced from lactic acid, which can be obtained from the maceration of starch and sugars in biotanks. Typically it is produced from Genetically Modified Corn, grown in the United States, then processed as noted.
Abbeon Cal $10 / lb
Informations about plastics
http://www.ides.com/info/generics (from http://forums.reprap.org/read.php?1,70471)
Paste
In physics, a paste is a substance that behaves as a solid until a sufficiently large load or stress is applied, at which point it flows like a fluid.
A paste extruder, such as as Syringe Based Extruder, could be adapted to Paste Extrusion a large number of materials, including Chocolate Extrusion, Frostruder, clay Ceramic Extrusion, etc.
Duroplastics
Duroplastic polymers are plastics that once hardened cannot reversibly change phase (molten) through heat. Solvents may dilute some of them (Acrylics, Polyesters in their lower molecular weight form) and by evaporation of the solvent they will harden again. This application, very common in solvent based varnishes and paints, is nevertheless not practical for RepRap, as the volatile solvents take a long time to evaporate and in large section or layer thickness, this evaporation cannot be regulated and controlled so as to produce uniform deposition layers (bubbles, hardening imperfections).
Is "duroplastic polymer" a synonym for "thermosetting polymer" ?
The most common way to obtain Duroplastics is by polymerizing their monomer and oligomer blends, also called Resins, through chain reactions, whether initiated by catalysts and radicals that spring from reaction with moisture, pH, oxygen, radiation or heat (thermosetting) or auto-initiation with another identical monomer or a suitable copolymer. Polymerization can be initiated by a simple change in pH, by adding an acidic or basic reactant (Furan resins, phenol-formaldehide (Resol), urea-formaldehide...)
For rapid prototype deposition, Duroplastic resins have to fulfill a number of conditions:
1) They have to have a long work time, meaning that they have to remain fluid, preferably without any changes in viscosity and state for the whole time frame of the deposition session. Failing to do so would mean that the depositing tool would get clogged as well as introducing deposition artifacts and distortions due to variations in flow rates.
2) They have to have the correct viscosity and plasticity, so that after deposition they don't sag too much or change shape noticeably. Additionally, at no moment during the hardening process should the volume of the polymer change severely.
3) After deposition they have to have suitable adhesive properties so that threads glue together with the best possible bond strength.
4) Once deposited, there has to exist a mechanism by which the polymer will set and harden, if possible, on command. The curing has to occur through the whole section of the deposited material, not just on the surface of the thread or layer. This point will be discussed under the section Catalysts and Initiators
These conditions are less restrictive if you want to use these polymers as casting resins to fill molds (built by the deposition technique).
Spontaneous polymerization resin blends
This section will describe resins that need to be stored in two separated components for them to remain fluid for long periods of time. The most common blends of this class, generally called Dual Component Resins have to be mixed in a given proportion just before usage and start the polymerization chain reaction as soon as the two parts are homogeneously mixed. Spontaneously polymerizing monomers will not be addressed in their pure state, due to their uncontrollable and often dangerous polymerization properties. Additives and fillers can tame these processes so as to make them useful in some cases.
Read more on spontaneous polymerization resin blends
Triggered polymerization resin blends
In this section we will discuss resin blends that can be mixed in their final composition and still be kept unchanged for long periods of time. They will only start polymerizing after having been given the right trigger effect (see Catalysts and Initiators)
Read more on triggered polymerization resin blends
Other Additives, Monomers, Fillers
Here you will find a number of filler materials: Go to Fillers section
A good website to find all types of monomers and oligomers with their descriptions and properties can be found at this very complete site:
Oligomers at Sartomer.com
Monomers at Sartomer.com
or at
BASF Resins
For Organic products I have found some sites that provide chemical products all over the globe. Go to their web and search for the systematic name or name parts of the product. If you cave a CAS number (unique number for a given product) these sites will deliver a very accurate search result list. All of these sites require you to register to get prices and place orders:
Chemexper web, will give you a list of companies that sell the searched compound
ACROS Organics
Concrete
If the entry is wrong here, move it to a better place.
The video is in german language. Maybe there are other sources.
Pricing for a house in the video 5000 US$
Used for building houses
Catalysts and Initiators
There are several chemical types of catalysts that are of use to RepRap. All of them, independently of their chemical type, fall into two categories of importance to RepRap and those will be discussed below:
Catalysts for dual-component mixes
Spontaneously catalyzed systems start the polymerization reaction as soon as the catalyst comes in contact with the monomer. They do not need any further external input to fulfill their initiator role, be it heat, moisture, radiation (UV, visible, IR...).
Catalysts for single-component mixes
TriggeredPolymerizationResinBlends need a triggering effect (a TriggeredCatalysts) to start their initiator role. This is an obvious advantage as they can be blended in the monomer mix and be kept on the shelve for significant amounts of time (weeks, months...). They will not clog any tubings, pumps or dispensers. Also, they offer one more level of control, being able to decide when and where to apply the trigger effect and sometimes also when to stop the chain reaction. These triggered initiators are usually more complex as the first category, specially if what you are looking for is a rapid reaction producing fast setting times through thick sections of material. One example of these systems are the acrylic based tooth fillings the dentists use, that are triggered by UV light. Many varnishes are also UV triggered but they have a much longer setting time and require hour-long exposures to achieve definitive hardening.
Misc
Cheese
Chocolate_Extrusion
Pancakebot
See Category:Food
See Paste
See Category:Edible Paste Extruders
See Category:Consumables
Gutta-Percha from tropical trees, a natural rubber latex like material
Wheat paste
Glue
In short, whatever thermoplastic type material you can extrude from a nozzle
See thermoplastic
Glossary of Terms and Definitions
Here you will find a short and basic explanation of terms used in all the sections above. If some term used above seems unclear to you, please post a message in the forum and I will see to add the term to this glossary.
Go to Glossary
3D printing is a flexible, efficient and profitable approach to production, but it requires more than a printer and filament. Between storage, ventilation, handling materials and equipment configurations, your 3D printing budget must accommodate additional items, especially if you plan to utilize a 3D printer’s exceptional versatility.
Before you explore the world of 3D printing, you’ll need a thorough understanding of the process and all the 3D printing supplies you might need.
Basic 3D Printer Supplies | Types of Printing Material | Cost of 3D Printing | How Hard Is 3D Printing?| Questions To Ask Before Buying a 3D Printer | What Industries Use 3D Printing? | Benefits of 3D Printing | Plate Your 3D Products at SPC
Of course, 3D printing starts with a printer. You can find many different types of 3D printers on the market,1 but some of the most popular styles for commercial users include:
Specialized printers also exist to work with materials like concrete and biological matter. Your printer must accommodate the material you plan to work with and offer an appropriate size and speed for your application.
The next major component of 3D printing is the printing material. We’ll discuss these in more detail later, but common options include plastics, resin and metals.
While the necessary 3D printer accessories vary by application and printer, some items you may need include:
3D printing materials can vary widely, with options that include plastic, powders, resins, metal and carbon fiber. These materials make 3D printing a promising option for many parts, from highly accurate aerospace and industrial machinery components to customized consumer goods.
Out of all the raw materials for 3D printing in use today, plastic is the most common. Plastic is one of the most diverse materials for 3D-printed toys and household fixtures. Products made with this technique include desk utensils, vases and action figures. Available in transparent form as well as bright colors, plastic filaments are sold on spools and can have either a matte or shiny texture.
With its firmness, flexibility, smoothness and bright range of color options, the appeal of plastic is easy to understand. As a relatively affordable option, plastic is generally light on the pocketbooks of creators and consumers alike.
Plastic products are generally made with FDM printers, in which thermoplastic filaments are melted and molded into shape, layer by layer. The types of plastic used in this process are usually made from one of the following materials:
Plastic items made in 3D printers come in a variety of shapes and consistencies, from flat and round to grooved and meshed. A quick search of Google images will show a novel range of 3D-printed plastic products such as cog wheels and Incredible Hulk action figures. Home craftspeople can even buy polycarbonate spools at most supply stores.
Today’s more state-of-the-art 3D printers use powdered materials to construct products. Inside the printer, the powder is melted and distributed in layers until the desired thickness, texture and patterns are made. The powders can come from various sources and materials, but the most common are:
In powder form, materials like steel, copper and other types of metal are easier to transport and mold into desired shapes. As with the various types of plastic used in 3D printing, metal powder must be heated to the point where it can be distributed layer-by-layer to form a completed shape.
One of the more limiting and, therefore, less-used materials in 3D printing is resin. Compared to other 3D-applicable materials, resin offers limited flexibility and strength. Made of liquid polymer, resin reaches its end state with exposure to UV light. Resin is generally found in black, white and transparent varieties, but certain printed items have also been produced in orange, red, blue and green.
The material comes in the following three categories:
Transparent resins of clear and colored varieties are used to make figurines, chess pieces and small household accessories and fixtures.
The second-most-popular material in the industry of 3D printing is metal, which is used through a process known as direct metal laser sintering (DMLS). This technique has already been embraced by manufacturers of air-travel equipment who have used metal 3D printing to speed up and simplify the construction of component parts.
Metal can produce a stronger and arguably more diverse array of everyday items. One of the main advantages of this process is that the printer handles the engraving work. As such, products can be finished by the box-load in just a few mechanically programmed steps that do not involve the hands-on labor that engraving work once required.
The technology for metal-based 3D printing is also opening doors for machine manufacturers to ultimately use DMLS to produce at speeds and volumes that would be impossible with current assembly equipment. Supporters of these developments believe 3D printing would allow machine-makers to produce metal parts with strength superior to conventional parts that consist of refined metals.
The range of metals that apply to the DMLS technique is just as diverse as the various 3D printer plastic types:
In the printing process, metal is utilized in dust form. The metal dust is fired to attain its hardness. This allows printers to bypass casting and directly use metal dust in forming metal parts. Once the printing finishes, these parts can then be electro-polished and released to the market.
Metal dust is most often used to print prototypes of metal instruments, but it has also been used to produce finished, marketable products and field-ready parts. Powderized metal has even been used to make medical devices.
When metal dust is used for 3D printing, the process allows for fewer parts in the finished product. For example, 3D printers have produced rocket injectors that consist of just two parts, whereas a similar device welded in the traditional manner will typically consist of more than 100 individual pieces.
You’ll also find other materials used in 3D printing, such as:
While 3D printing can offer cost savings, expenses go beyond the printer and printing material. Depending on your application, a 3D printer alone can cost between several hundred and tens of thousands of dollars. Cheaper models are typically inappropriate for commercial applications. Business-grade options might range from $1,000 to $5,000.9 The cost of industrial-sized 3D printers — usually SLS printers — goes up from there.
Printing materials similarly vary by application. Basic PLA 3D printer filament might cost less than $20 for a 1 kilogram (kg) spool.10 PETG filament is a similarly affordable option that offers food safety for around $20 per kg.11
Moving away from plastics, expect to spend more on resins and flexible materials like thermoplastics. Specialty materials, like those with metal, carbon fiber or polymer, are some of the most expensive.
Other costs to consider include 3D printing supplies, like those we listed earlier, and repair expenses. Over time, you may need to replace certain parts or pay for the skills of experienced technicians who can properly fix the equipment. You’ll also need to consider the costs of finishing tasks, such as heat treatment, metal machining and electroplating.
While the expenses of 3D printing vary widely, many companies still find significant cost savings from the efficient processes, short lead times and design flexibility.
3D printing can be challenging due to the need for a diverse skill set. You’ll combine creativity, math and computer-aided design (CAD) skills to create and troubleshoot issues with a 3D printer. Over time, you’ll learn the best tactics for designing a piece, selecting the right materials and identifying proper configurations. Subtle differences contribute to the quality of the finished piece, but each application is unique, so it will take trial and error.
Part of the challenge of 3D printing comes from learning software programs. Even with a strong background in CAD, you may need to spend some time learning your printer’s software. Online resources, manufacturer support and CAD courses can help improve your knowledge of 3D printing.
3D printing requires patience and problem-solving skills, but it is rewarding once you get past the learning curve. Here are a few beginner tips for mastering 3D printing:
If you’re considering buying a 3D printer, build a thorough picture of your requirements and options. Ask yourself these questions as you look for the right 3D printer:
3D printing is an attractive option that’s gained viability across industries. As technology has advanced, 3D-printed parts have found homes in everything from jet engines and automobiles to consumer goods.
The aerospace industry makes good use of 3D printing due to the need for intricate, precise components. While subtractive manufacturing processes can make these components difficult to achieve, the additive nature of 3D printing supports complex structures with fewer parts. Aviation companies can use 3D-printed components to simplify assembly, reduce potential opportunities for failure and save time and money.
GE Aviation and Boeing now use 3D printing in jet engine prototypes and end-use parts.12 This technology offers high precision and customization for these applications.
In space, 3D printing’s on-demand capabilities make it a promising option for creating parts without requiring additional manned space travel. For example, technicians on the International Space Station (ISS) could simply print a part instead of having one sent up through a resource-intensive launch.
The automotive field is a good fit for 3D printing. It allows manufacturers to print intricate parts as needed and save significantly on material waste. Ford has been using this technology since the 1990s and is building an entire 3D printing center in Europe to support its new all-electric vehicles.13
In the manufacturing industry, where interruptions have considerable costs, 3D printing offers the benefit of speed. Manufacturers can create parts as needed without long lead times, keeping operations moving smoothly with on-demand part printing for items like injection molds and spare parts.
3D printing has promise in the field of medicine, particularly regarding medical devices, prosthetics and implants. It can help create custom orthopedic products or dental aligners, with each item made to order for the patient’s unique anatomy.
Across industries, 3D printing comes with many advantages:
Electroplating 3D parts makes them even more versatile. While plastic parts won’t conduct electricity, you can electroplate them to add conductivity and open up more design opportunities. SLA printers work best with electroplating because they produce smooth layers that can better adhere to the metal, but other printing methods can also accommodate electroplating. Electroplating onto printed components can add conductivity and a wide range of other physical properties,14 like strength and specific surface finishes.
You can find electroplated 3D printed parts in many of the applications we’ve discussed, such as on-demand parts, prototyping and large-scale production.
Despite its flexibility, electroplating comes with potential challenges. One of the most difficult aspects of electroplating is staying up to date with the technology. The field of injection molding often introduces new resins and techniques that might affect how the products interact with different types of electroplating. You may need to stay in the loop on how these new materials might impact characteristics like rigidity, adhesion and flexibility. Plastic sometimes poses unique plating challenges,15 so staying knowledgeable can be difficult.
Electroplating is a complex process, but working with a professional team who understands industry updates allows you to maximize the value of your 3D-printed parts.
For more than 90 years, SPC has offered prompt, affordable, high-quality plating services. Operating from our 70,000-square-foot Pennsylvania production facility, we offer services to customers across North America and abroad. As one of the most globally recognized names in the plating industry, our customizers know they can trust us for plating, metal finishing and other solutions.
With each passing decade, SPC has remained at the forefront of innovation in the world of plating. Now, with 3D printing technology approaching maturity, we are determined to meet the demands of this exciting and revolutionary new form of product creation.
At SPC, our extensive background with plating applications has allowed us to apply these capabilities to 3D-printed parts. In recent years, we have applied surface finishing to 3D parts manufactured by electronics and automotive companies as well as in numerous other industries. Regardless of your industry, we can customize a process that will suit your products.
Ultimately, companies that master this technology are bound to have an edge over their competition. Browse our 3D-print plating page16 to learn more about the options and contact us today for a free quote.17
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