There are a lot of CNC machining design tips to share with you. One common design issue that we see a lot of are walls that are designed too thin. With CNC machining, if your walls are designed too thin you risk warping and affecting the overall accuracy of the part. StartPrototyping recommends keeping walls for metal parts > 0.8mm and walls for plastic parts > 1.5mm.


Follow this design tip and others coming up for a part design that is well suited for CNC machining. Below is some further CNC machining guidance which may help you with designing a successful part for CNC machining.

StartPrototyping Max CNC Machining Size: 3000x1200x850mm

High speed
High dimensional accuracy
Great surface finish
Wide material selection
High volumes
Rapid prototypes

It can be expensive for complex
parts and for larger parts.

Tolerances – ISO 2768-1 states the tightest tolerances possible as standard are +/- 0.05mm for metals or +/- 0.2mm for plastics. Tighter tolerances should be discussed case by case.

Surface Finishes
Sand blasting
Plating & More

Popular Materials
Plastic ABS, PC, Acrylic
Metal SS304, 316
Aluminium 6061, 7075
Plus many more

Tips and Tricks
Radius internal corners
Loosen tolerances where possible
Keep features perpendicular to the six sides
Reduce the number of setups
Keep it simple

About Start Prototyping

Start Prototyping mainly supply our rapid prototyping service and plastic injection manufacturing for many 3D print companies in the world. Start Prototyping has been engaged in rapid prototyping about 10 years, helping too many designers to turn their ideas into reality. Most of the conceptual prototype of the design has been successfully put into the market and has achieved good benefits. Among them, the most representative metal prototype machining, plastic prototype machining, CNC aluminum machining, Low-Volume Manufacturing, processing technology including CNC machining, vacuum casting, rapid tooling, 3D printing and so on. We have the standard quality inspection process, which is completely in line with the customer’s industrial design. It’s a great honor to be a partner with you. Contact Info Contact:James Yuan Company:Start Prototyping Add:LongGang Village, LongXi Town, BoLuo County, HuiZhou City,GuangDong Province, China Tel:+86-13352636504 Email:[email protected] Web: