A Corner Radius or Corner Radii is a technical design term for simply rounding out or making smooth any sharp corner on a design. There are two types of radius: internal for inside corners and external for outside corners. Rather than leaving these corners sharp, a radius equal to at least 0.5 times the adjacent wall thickness is usually used.

A Fillet Radius or Fillet Radii is a rounding of an inside corner and are designed into molds to increase their load bearing strength and to improve both the plastic injection molding process and quality of the plastic part. For those reasons a fillet radius should be a standard allowance on every casting design. A “fillet radii” or “fillet radius” are commonly found on the bottom of a compartment or an inside corner and can be used in between bosses, ribs and gussets to connect them to a wall for added strength.

A Round Radius or Round Radii is a rounding of an outside corner of a part design and are designed into molds to increase their load bearing strength and to improve both the plastic injection molding process and quality of the plastic part. Sometimes a “chamfer” can be used to create a radius type design.

Why use a design radius?

A radius is usually used for two reasons:

1. To smooth out sharp corners on a design to make the design safer and more comfortable for handling.
2. Rounding of sharp corners for plastic injection molding purposes so the outside corners of the part can fully fill and also helps prevent cracking of the inside corners of the part.

Injection molding is a manufacturing process in which solid thermoplastic pellets are melted and injected into a mold. After this hot melt and fill process is completed the newly formed part is cooled back to a solid. During both, the injection and cooling stages, of the manufacturing process there are several design factors that may affect the quality of the final product and the consistent repeatability of the plastic injection manufacturing process.

It is always best to have your manufacturer check the design to make sure it matches their manufacturing equipment tolerances.

Sharp corners at the base of bosses, ribs and gussets should have Radius Design to help offset stress points. The edge where a boss meets a wall should have a radius used to reduce the sharp corner without increasing the wall thickness to much that it creates a sink problem.

A message from the 3D Printing Expert and Product Design Experts president/owner:

I’m here to assist inventors, companies and organizations with all their 3D CAD Design Radius and Manufacturing Pricing. I will provide you with expert design radius service and solutions.
Thanks for taking the time to view this 3D CAD Radius Design website.
I look forward to working with you on your radius design goals, Anthony, President/Owner

Contact Us Now at 3D Printing and Product Radius Design File Experts

Written by Whitney Hipolite for 3DPrint Online Magazine – The Voice of 3D Printing / Additive Manufacturing
(this is a partial repost from the original news article)

For one young man, from Jupiter, Florida, named Josh Camitta, this wasn’t the case, simply because he discovered that 3D printing could provide him with answers that previous generations simply could not come up with.

“The product I have created is called The Grale; The first ever handheld vegetative (herbal) processor and weighing unit,” Camitta tells 3DPrint.com. “Once awarded the patent for this grinder/scale apparatus, I became highly motivated to take this project to the next level.”

Camitta’s apparatus could certainly be quite the useful device for chefs, cooks, and food vendors alike. It was just getting this product to market that was the challenging part. It all started with the desire and need to create a working prototype, and that’s when Anthony Dichiara of 3D-Printing-Expert.com came to the aid.

The Grale features an optimized grinding process with two sets of aluminum CNC milled teeth. A user is required to choose their desired herb or vegetative material. It is then placed into the device, where it is ground before falling through to the next chamber. Food such as herbs, coffee, spice, etc. may be used in raw form. When the material/food falls into the chamber, it is simultaneously weighed.

“For this weighing process the material is collected on what we call the reservoir tray,” explained Camitta. “From here the user has many options. One option is to simply unscrew the top and pinch out the desired portion. Alternatively, you could opt to use the small door (EZ-Pour Technology) which allows the operator to simply swing open a magnetized door, enabling the material to pour out, like a tea kettle. Additionally, one can simply open the larger door and remove the entire reservoir tray for easy access and control.”

Camitta originally was prototyping his design using stereolithography 3D printing technology, but found that it was really quite expensive, inefficient, and restrictive for his purposes. So when he found Dichiara with the 3D Printing and Product Design Company, he was greatly relieved. Dichiara was able to print out a whole swath of parts quickly and inexpensively, allowing Camitta to better understand how his device would function and fit together.
“The combination of a strong engineer (Anthony DiChiara) and the technology of a his 3-D printing process, made making small adaptations and changes a fluid part of the prototype process,” says Camitta. “This has enabled my project to continue to progress with both confidence and pace as it moves towards completion.”

This is just one more shining example of how 3D printing is allowing the innovators of the world test the feasibility of their inventions using a really tangible means of production.

For the full article go to 3DPrint “The Voice of 3D Printing / Additive Manufacturing”

3D printing is also known as 3d rapid prototyping. It is a prototyping process whereby an real object is created from a 3D CAD design. The digital 3D CAD model design is saved in STL file format and then sent to a 3D printer. The 3D printer will then have the three dimensional instructions to print the design layer by layer and form a real object on a flat build bed.

“3D Printing has emerged as the most valuable new tool for inventors looking for prototypes”.

“3D printing is positively impacting many industries, such as automotive, medical, business & industrial equipment, education, architecture, and consumer-product industries”.

For creating a three D printed object you need a digital 3D CAD design model. The digital 3D-model is usually saved in STL format and then sent to the printer.

I’m here to assist and service inventors, companies and organizations with all their 3D printing service needs.