Rather than seeing 3D printing as a potential replacement for injection moulding, these two manufacturing technologies can be complementary and used together to improve quality of plastic products, shorten pre-production cycles, take advantage of mass customisation to cater to more product variants before moving onto large batch production.

One of the most common applications for insert molding is the creation of metal attachment features for fasteners. Fasteners enable assemblies to be securely assembled and disassembled without product damage. Heat-set threaded inserts are molded into plastic to reduce the risks of thread damage during installation.

Despite the many benefits of insert molding, a few disadvantages need to be considered before choosing to use this sub-process. Â

Metal 3D printing can also be used as a manufacturing method to 3D print injection moulds. This is one of the latest innovations in established 3D printer markets such as the US and is a game changer for the plastic injection moulding manufacturers, especially when cnc machining is most commonly used in manufacturing molds in injection molding. 3D printed free-form cooling chambers has considerably reduced cooling time over machined straight channels by lowering polymer and cavity surface temperatures. 3D printed inserts for injection molded tools is another quick way to for custom injection moulding  and modify before committing to production tooling. Quicker cycles increase productivity, more variants and more uniform cooling improves part quality and minimises defects from heat transfer. Not all 3D printer for metal is alike, ask us which is best suited for your requirements in precision and manufacturing conditions.

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There is a misconception in the manufacturing world that 3D printing is going to replace injection moulding, especially with the proliferation of 3D printing technologies in recent years. Injection moulding is still used in the majority of plastic parts for industry due to the familiarity of quality and process as well as speed for mass production.

Injection molding is a broad term used to describe one of the most important processes in the manufacturing industry. It’s a process that requires a mold, typically made of metal with a cavity in the shape of the desired part. Molten plastic is injected into the mold and ejected. The process repeats to produce thousands of identical parts. It’s safe to assume that every large-volume plastic part on the market has come from an injection molding machine because the benefits of using injection molding for production are numerous. These benefits include low cost per part, short cycle times, extensive materials, and compatible, in-tolerance parts.

Despite the many benefits of overmolding, a few disadvantages need to be considered before deciding to use this process. Â

Enable quick, uniform cooling of the ejector pin's unique shape.Results : Hot spot eliminated at contoured pin with tiny cooling channels. Ideal for cooling large surfaces 0.6-0.8mm from contour, helix-shape channel maximised part strength.

Various sub-processes add further capabilities to this already versatile technology. This article will specifically explore insert molding vs. overmolding and the advantages of each.

The 3D printing process for manufacturing works best with low volumes, when it is difficult to justify tooling costs. 3D printing parts including prototypes help the customer’s decision making process and has less cost implications with modifications as compared to the traditional injection molding process.

An Industrial moulding company utilised metal 3D printing (Direct metal laser melting) technology to 3D print a mould core with conformal cooling channels. The core contained eight independent, internal conformal cooling channel at 5-8mm in diameter. 3D printing lends design freedom for a more efficient heat exchange and imcrease the overall injection moulding process’ productivity through decreased cooling cycle time, defects and improved the injected plastic parts’ aesthetics.

Overmolding is essentially a type of insert molding. However, overmolding vs. insert molding is, as the name suggests, plastic is molded over another molded part. The first component is made inside an injection mold, and it is then placed into a second mold to add the over-molded material. This technique combines multiple plastics for either practical or aesthetic purposes. For example, one might use different durometer plastics to mold a softer plastic over a more rigid one to make a part easier to grip. Using multiple colored plastics in an overmolded part can also distinguish the product from other brands. Overmolding is regularly used on the handles of tools like screwdrivers, power drills, or toothbrushes.

Injection moulding makes use of moulds or dies. The part design is used to create the inverse in split-die tooling, the tooling cavity is traditionally referred to as female die and the other as the male. These dies are commonly CNC machined out of metal material such as aluminium or tool steel that can handle molten material. Molten material is poured into the mould via an injection method and the moulds are cooled to release complete plastic parts. There is also metal injection moulding, although the following will focus on plastics.

To compare both manufacturing processes, the following overview recaps pros and cons of injection moulding and 3D printing.

Other plastics 3D printing include Stereolithography (SLA) and Material jetting such as Polyjet 3D printing. SLA technologies is typically used in high precision and low cost single use parts.

3D printing or additive manufacturing refers to the process where the material is built layer by layer. 3D printing creates 3D objects by slicing a computer aided design (CAD) file into layers to reproduce the physical part using filament or powder material. Contrary to popular belief, filament based 3D printing (Fused deposition modeling FDM or Fused filament fabrication FFF) is not the same as powder bed fusion 3D printing such as selective laser sintering (SLS) or Multijet fusion (MJF). FDM parts tend to require support structures, have uneven strength in some directions, has a strong layering effect which could result in shear failure (separation) and the nozzle tends to limit precision. This limits FDM printers to low strength rapid prototyping. Common plastic filament material includes ABS, PLA and PET.

On the other hand, a SLS 3D printed part can be used as an end use product, made by precise sintering layers of nylon powder with the use of powerful lasers, without the need for support structures. Such high performance 3D printing machines tend to cost more.

Injection molding, which includes the sub-processes insert molding and overmolding, is a versatile and low-cost manufacturing production process that is used in the large majority of consumer products. Injection molding often results in the lowest cost per part when compared to other manufacturing techniques like CNC machining and even 3D printing.Â

3D printing is great for batch production of less than 1000 parts, suitable for complex part that may require mass customisation, frequent design changes and can be used for creating a 3D printed mold. Injection moulding, on the other hand, is better for bulk production in the thousands of simple designs.

Insert molding is a subset of injection molding techniques similar to overmolding where metal components are placed into a mold cavity before the actual plastic injection. The insert is precisely positioned inside the mold either manually or by a robotic arm. The mold then closes, and plastic is molded over the insert, creating a single part.

With the high initial cost set up and time-consuming nature of injection moulding tooling design, 3D printing is more accessible for prototyping and testing of design before tooling commitments. The cost of modifications in injection moulding is high unless metal 3D printed inserts are considered, or the use of 3D printed conductive metal to improve heat dissipation in concentrated areas and 3D printing of injection moulds with conformal cooling chambers.

Anyone can access multiple plastic and metal 3D printing processes with the use of Additive Engineering’s 3D printing service, 3D printing material and expertise.

Injection moulding and additive manufacturing / 3D printing are often used as manufacturing techniques for plastic parts such as drink bottles, lids, caps, covers, housings, brackets, packaging, car parts and toys.

Whatever you are most familiar with, whether it is ‘printing vs injection molding’, interests in ‘3D printed injection mold’, if you have an plastic part project, additive manufacturing enquiries or past experiences with different 3D systems, we like to hear from you.

First of all, is it injection moulding or injection molding? Injection moulding originates in Britain and is often used in Australia and Canada while injection molding is the American spelling. Since Additive Engineering is based in Australia, we use injection moulding to answer enquiries about injection molded parts, mold cavity, injection molder, manufacture of injection mold, plastic injection molding, 3D printed injection molds / printed molds and an injection molding machine.

Is it the case of injection moulding vs 3D printing? How does one choose which manufacturing process is better suited? Why not both? When starting a project involving plastic manufacturing, the factors to consider include material properties, process’s flexibility to design change, precision, finish, volumes, time and cost.

There are various sub-processes within injection molding that add further capabilities to this already versatile technology. This article will explore insert molding vs overmolding and the advantages of each.

The good news is, at Additive Engineering, we offer injection moulding, vacuum casting, metal and plastic 3D printing services with a range of 3D printer options and an experienced team to support you.

Small, unique cooling channels inside the mould of a bucket lid insert allow for parallel cooling of small geometries not possible with other methods. Results : Faster heat transfers due to short channels. Uniform cooling of material, maintained properties

Cooling channels form a mesh structure to enable uniform surface cooling of a glass insert for spectacles, just 2-3mm beneath mould contour. Results : High-pressure stability throughout arched structure and temp control across large areas

Insert molding can also eliminate the need for fasteners by including the necessary metal parts in the mold, thus firmly securing the parts into a single bonded component.

All manufacturing methods have their own strengths and disadvantages and which process to use depends on what requirement is a priority. In some cases, metal 3D printing could even manufacture inserts and complex injection moulded tools with conformal cooling chambers to improve traditionally injection moulded products.

Once injection molding is chosen for a specific application, the next step is often whether to use insert molding, overmolding or just stick with plain injection molding. When trying to weigh the advantages of the processes, it is important to accurately define the product application. Each of these processes has specific use cases that are suited to different product types. It can be difficult to gauge which process will best suit your particular product, so it’s good to get expert advice early on. Contact a Xometry representative to leverage decades of vast manufacturing expertise. We will help steer your design decisions in the right direction so that you can choose between insert molding vs. overmolding or just injection molding.Â