What is the difference between standard and 3D printed insoles?

Insoles are an essential tool for people with foot pain, posture problems or strains. Traditionally, insoles have been custom-made via manual operations or CNC milling machines. Today, 3D printing technology offers a solution that benefits podiatrists and patients alike.

What are the main differences between standard soles and 3D printed soles? And why are more and more podiatrists choosing this modern production method?

How are standard insoles made?

Traditional soles are produced in a variety of ways. The most common methods are:

• Manual manufacture – A podiatrist manually adjusts an existing sole by sanding, gluing and possibly hardening it with a top coat. This process is labor intensive and can take a lot of time per pair.
• CNC milling – A sole is milled from a block of material based on a digital scan. Although automated, this results in a lot of waste – up to 95 percent of the material used is discarded.
• Prefabricated soles – Some suppliers offer standard soles with slight modifications, but these offer less customization and optimal support than fully custom-made soles.

While these methods have proven their worth, they also present challenges: the manual process is time-consuming, CNC milling is not sustainable, and external production causes delays and additional costs.

How do 3D printed insoles work?

3D printing involves building a sole layer by layer from a special material, based on a digital scan. This process offers several advantages over traditional methods:

• Full customization without manual finishing – The sole is printed directly to specification, so sanding, gluing and adjustment are unnecessary, saving time and increasing precision.
• Less waste – Unlike CNC milling, 3D printing uses only the material needed, making the process more sustainable.
• Possibility of combining different hardnesses – Different areas within a single sole can vary in hardness, so certain parts are firmer while others offer more cushioning.
• Faster production and less dependence on suppliers – 3D printers can be used in-house, increasing flexibility and reducing lead time from diagnosis to delivery.
• Cleaner and healthier work environment – No sanding dust or glue fumes, and no need for additional exhaust systems.

Why switch to 3D printed soles?

Podiatrists who switch to 3D printing technology not only save time, but also improve the efficiency of their practice. Many podiatrists run into the following problems: time loss due to manual post-processing, delays due to outsourcing to CNC milling, high cost of waste disposal and external production, and unhealthy working conditions due to dust and glue odors.

A 3D printer, such as the Modula, solves these problems. It allows podiatrists to produce custom orthotics directly in the practice, with minimal rework and without relying on outside parties. This results in time savings averaging 20 percent, which equates to a full workday per week.