Consider the desired properties of your object and the capabilities of your injection molder before you make your choice. From there, simply follow the bespoke instructions on your injection molder to quickly and efficiently produce your parts.

Grey Pro Resin has a lower thermal conductivity than High Temp Resin or Rigid Resin, which leads to a longer cooling time, but it is softer and can wear hundreds of cycles.

Depending on the geometry and the size, multiple molds can be printed at once on a build platform to increase printing efficiency.

Our aluminum injection molds are productive enough to produce in small / medium series. The aluminum mold is also ideal for making a good material prototype in a short time.

The exact approach to DIY injection molding will vary based on your desired design and volume, but these tips and tricks will help increase your success rate.

Now that you’ve designed and 3D printed your mold, you can mold the parts on your benchtop plastic injection molding machine.

To reduce the visibility of print lines on the finished part, print the mold with a smaller layer height (50 or 25 microns per layer instead of the default 100). Note that this increases print time.

Injection molding is ubiquitous as a manufacturing process—in fact, the majority of plastic products in the world today are manufactured by injection molding. While it is an ideal technique for large-scale production needs, traditional CNC machined metal molds have prohibitive high costs and long lead times for low-volume production.

A benchtop injection-molding machine, such as the Galomb Model-B100 or the Holipress. There are a number of benchtop injection molders on the market that vary in cost. Many of the lower cost molders use a hand-driven plunger, while some of the more expensive units use a screw or pneumatic system. Some of our customers have recommended systems from Minijector, Morgan, APSX, or Micromolder as well. Desktop automated molders such as the product line from Babyplast are good alternatives for mass production of small parts.

A 3D printing material that can withstand the temperature and pressure on the mold during the injection molding process. We recommend the following materials for Formlabs SLA 3D printers:

MDP is the specialist in good material prototypes thanks to its expertise in aluminum and steel molds. The MDP TEAM group is your development center for the industrialization of your plastic and metal-plastic parts as well as for the assembly of your finished and semi-finished products. The good material prototype is made from an aluminum mold and in a very short time thanks to our technological excellence. The good material prototype is a prototype with the same qualities as an injected part, but with a short production time and lower investment.

Now, you can position your mold. Ensure that the object fully intersects with the inlet for the molten plastic during the injection molding process. Use orthographic mode, engaged via “toggle perspective/ortho,” to make this more straightforward.

Want to learn more about injection molding with 3D printed molds? Download our white paper for detailed guidelines for using 3D printed molds in the injection molding process and see real-life case studies with Braskem, Holimaker, and Novus Applications.

In order to offer you a fully integrated solution, we have decided to create a large group in France and in Europe: MDP Team. The combination of our know-how in the design of aluminum molds and plastic injection allows us to respond to all your problems. Product launches, test phases, prototyping, small series… Plastmold, our plastic injection plant, allows us to have an unequalled reactivity for the realization of your industrial project.

First, pick the CAD software tool of your preference to design the mold insert. We’ll use the open-source Blender, but the workflow should be fairly similar in any other CAD software.

Stay updated with the latest 3D printing news, interviews with experts from around the world and tutorials on how to leverage 3D printing.

Your mold is now ready for printing. Export each half, making sure to check the “Selection Only” box in the Blender exporter.

Creating custom molds using a stereolithography (SLA) 3D printer, like the Form 3, is simple and convenient, allowing you to leverage the benefits of both 3D printing and traditional molding techniques.

For prototyping and low-volume production (approximately 10-1000 parts), 3D printed injection molds provide a time- and cost-efficient solution. They also enable a more agile manufacturing approach, allowing engineers and designers to test mold designs, easily modify them, and then continue to iterate on their designs much faster, while being orders of magnitude cheaper than traditional CNC machining.

Depending on the injected material, adhesion of the part to the mold can cause deterioration of the mold during extraction, in particular with flexible materials such as TPUs or TPEs. Using a mold release agent is a good solution to help separate the part from the mold. Silicone mold release agents are compatible with Formlabs Grey Pro Resin, High Temp Resin, and Rigid 10K Resin.

Interested in other applications of 3D printed molds? Download our white paper that also covers thermoforming and casting with elastomers.

In Blender, use the eye icon in the scene explorer to toggle off one half of the mold. Once your workspace is set up to your liking, set both halves of the mold to the “wire” draw type under the Object menu, as in the image below.

To 3D print the mold, it’s essential to pick a material that can withstand the temperature and pressure on the mold during the injection molding process.

Turn the visibility of your current mold core off, and turn the other side on. Repeat the process to ensure that the object fully intersects with the inlet of the other half of the mold core. With your object lined up, you’re ready to subtract the area of two intersecting objects by using the “boolean difference” function in Blender.

Setting up the print only takes a few seconds in PreForm, the print preparation software for Formlabs 3D printers. If your mold design requires support structures for printing, make sure to orient the mold halves in PreForm so that the cavity faces up. This will simplify post-processing and ensure a high-quality surface for your molded parts.

High Temp Resin offers a heat deflection temperature is 238 °C @ 0.45 MPa that is suitable for injection molding. This material is more brittle, but is recommended for materials with a high molding temperature and to reduce cooling time.

Our know-how is exported year after year outside France. The quality of our aluminum molds is recognized in this rather restricted sector of plastic injection and good material prototype.

If you have more questions about the workflow, make make sure to check our article FAQ: Injection Molding With 3D Printed Molds.

Building a setup for DIY injection molding does require some investment. It takes both money and time to acquire the right equipment and to master using it. However, these costs are in many cases still lower than the cost of a single metal mold, so the eventual time and cost savings, once you’re up and running, will easily offset the initial effort.

If designing for an aluminum mold frame, add .125 mm of extra thickness to the back of the mold plates to account for compression forces and to ensure a complete seal.

In this guide, we’ll walk you through the process of DIY injection molding and share all the tools and tips necessary to utilize plastic injection molding in-house using 3D printed molds.

A high-performance desktop SLA 3D printer, like the Formlabs’ Form 3. The Form 3 can produce accurate molds with crisp features, and a smooth surface finish that will yield high-quality final molded parts. Beyond DIY injection molding, an SLA 3D printer is also a valuable asset for prototyping and other applications throughout product development.

Do you have a prototype to produce before launching a large-scale industrial production ? The design of an aluminum injection mold is THE quickest solution to set up. MDP makes your aluminum mold in DAMPIERRE. We then entrust the plastic injection to Plasmold, a subsidiary of the group.

You have a wide variety of materials to choose from for injection molding. Formlabs and our customers have tested the following materials with 3D printed injection molds:

Based on internal testing and case studies with our customers, we suggest to choose the 3D printing resin based on the criteria from the table below. Three stars means the resin is highly effective, one star is less effective.

The conversation around 3D printing and injection molding is often oppositional, but it’s not always a question of one versus the other. By directly 3D printing parts or using 3D printed molds for injection molding for prototyping and low-volume production, you can leverage the benefits of both technologies. This will make your manufacturing process more time- and cost-efficient and allow you to bring products to the market faster.

Adding two to five degrees of draft on surfaces perpendicular to the direction of pull will allow the part to be removed more easily and will minimize degradation of the mold.

Select the first half of your object, and choose the boolean option under the Modifiers Menu. Select the object you’re cutting, and make sure that the “difference” operation is selected. Apply the operator, and do the same for the other side. It should look something like the image below. If you get stuck here, this tutorial on adding interlocking components to a design may be helpful.

Download our white paper for guidelines for using 3D printed molds in the injection molding process to lower costs and lead time and see real-life case studies with Braskem, Holimaker, and Novus Applications.

Before purchase, make sure to evaluate the injection molder carefully against your production requirements. For large parts, industrial processes will still be necessary. This DIY injection molding technique is best optimized for producing small parts at low volumes.

Rigid 10K Resin is an industrial-grade, highly glass-filled material, which provides a solution that can cope with a wider variety of geometries and injection molding processes. It has an HDT of 218°C @ 0.45 MPa and a tensile modulus of 10,000 MPa, making it strong, extremely stiff, and thermally stable.

MDP – Moule Design Prototype realizes the design of aluminum injection molds for your small and medium series. Established in the Jura, our company MDP is specialized in the design of industrial aluminum molds. Our group also owns a plastic injection company: Plastmold. Thus, we master the design of your good material prototype from A to Z.

Download the blank mold insert design files—you’ll use them to create your injection mold design. The designs can also be easily scaled to accommodate most injection molders and mold frames. Alternatively, you can also design your own mold insert for the using the cavity diagrams of the master mold frames.