For most UK manufacturers, the useful question is not “which is better” but “which is the right tool for this job”. Both processes are mature, both have specialist UK and Irish suppliers, and both are often used on the same product at different stages of its life. 3D-printed prototypes are often validated into a production tool, or short-run 3D-printed service parts support a product that was originally moulded. In this guide, we\u2019ll summarise the best use cases for each process, and explain how recent developments may have tipped the scale, depending on your project volumes and part geometry.<\/p>\n\n\n\n\n\n\n\n
Gone are the days of 3D-printing (also known as additive manufacturing) being purely a prototyping process. Developments in printing technology and an increasing number of polymers, including engineering materials, being used in 3D printing means that additive manufacturing is very capable of creating functional, end-use components. And while injection moulding has been around for decades, the technology involved, especially the rise of digital products and increased process monitoring, means the manufacturing process can remain efficient over a wider product scope.<\/p>\n\n\n\n
Volume is always a key factor. 3D printing will win out for small quantities, and as the volume rises, injection moulding will catch up and take over. Other factors are also essential, however. The injection mould tool required for moulding is a great advantage, offering unparalleled repeatability and tight tolerance output, but the upfront cost means moulding projects may be unviable at lower volumes. With no tooling costs, 3D printing has an advantage, and the nature of the additive process means more complex shapes, including hollow or internal geometries, impossible to achieve with injection moulding, are now feasible. Rapid iteration is also a huge advantage for additive methods. With no mould tool to modify, or to build, design changes and new product iterations can be worked on almost instantly. <\/p>\n\n\n\n
So, where\u2019s the tipping point? In terms of volume, usually between 500 and 2,000 units, depending on part size and material. However, it’s not simply a question of volume, other key considerations must be accounted for.<\/p>\n\n\n
Injection moulding requires a tool. The tool is a significant upfront cost. Once it exists, each part comes out cheaply, with the piece-part cost dropping to a small fraction of the additive equivalent at volume. 3D printing has no tool cost, but each part takes measurable machine time, so the piece-part cost stays roughly constant no matter how many you make.<\/p>\n\n\n\n
So the comparison is: tool cost plus a low piece-part cost multiplied by volume, versus zero tool cost plus a higher piece-part cost multiplied by volume. Plot them on a graph and they cross. The exact point depends on the size and complexity of the part, but in practical terms:<\/p>\n\n\n\n
There are situations where additive manufacturing is the right answer even for higher volumes, not because of cost, but because of what it can do that moulding cannot.<\/p>\n\n\n\n
For any of these, start with a UK 3D printed part manufacturer<\/a> who can advise on the right technology (SLA, SLS, MJF, FDM, PolyJet) for the part and the production context.<\/p>\n\n\n\n In practice, many new products start with 3D-printed prototypes for form, fit and function testing, graduate to a short run of 3D-printed production parts for market testing, then commit to an injection mould tool once demand is validated. The total development cost comes down, and the risk of commissioning an expensive production tool for a product that underperforms disappears.<\/p>\n\n\n\n A related hybrid is using 3D printing for the tool itself: printed mould inserts that sit inside a master tool and can be produced in days at low cost. Alternatively, tools with inserts, or machined from aluminium rather than steel can bring the cost and therefore the minimal volume for a project down significantly. Again, the most suitable option for your project depends on volume, geometry, demand and budgets, but experienced toolmaking companies<\/a> and moulding companies<\/a> can run these costs for you.<\/p>\n\n\n\n This is worth a conversation with a prototype toolmaker<\/a> if you have a tight-deadline short run and a part that suits the approach, as many companies specialise in this middleground.<\/p>\n\n\n\n If you are still undecided, run through these in order:<\/p>\n\n\n\n Still undecided? Or does your project fall into the grey area between each process’s speciality? In that case, it\u2019s sensible to make a cost comparison for both processes, side by side, based on your volumes and spec.<\/p>\n\n\n\n On PlastikCity, you can submit one RFQ to vetted 3D printed part manufacturers<\/a> and, separately, to UK injection moulding companies<\/a>. To explore short-run moulding specifically, use the Low Volume Moulding Companies<\/a> category, which contains moulders specialised in lower volume runs, with lower minimum order quantities. This is a great place to start for projects sitting in the uncertain middle area.\u00a0<\/p>\n\n\n\n Three quotes on each side gives you a real cost curve, making the decision straightforward.<\/p>\n\n\n\n The honest truth about this comparison: the technologies are complementary, not competing. Each process has its successful niche, with a small area of crossover, but speaking to the right suppliers means you\u2019ll be presented with all of the options, and receive an honest assessment of your project.<\/p>\n\n\n\n PlastikCity advertises only pre-approved UK and Irish suppliers. PlastikCity has been established for over twelve years and now brings together more than 260 vetted Partner companies across 400+ categories covering the UK and Irish plastics supply chain. It is free for buyers, and PlastikCity takes no commission on awarded contracts.<\/p>\n","protected":false},"excerpt":{"rendered":" For most UK manufacturers, the useful question is not “which is better” but “which is the right tool for this job”. Both processes are mature, both have specialist UK and Irish suppliers, and both are often used on the same product at different stages of its life. 3D-printed prototypes are often validated into a production […]<\/p>\n","protected":false},"author":101014,"featured_media":3285,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3,439,441],"class_list":["post-3282","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-plastikcity-blogs","tag-plastic-manufacturing","tag-vacuum-forming","tag-vacuum-moulding","post-preview"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\tWhere injection moulding wins regardless of scope<\/strong><\/h2>\n\n\n\n
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<\/strong>The hybrid approach most UK manufacturers actually use<\/strong><\/h2>\n\n\n\n
<\/strong>A decision checklist<\/strong><\/h2>\n\n\n\n
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<\/strong>Getting comparable quotes<\/strong><\/h2>\n\n\n\n