About Coex and Our Team


We believe success is a great product

delivered by great people


You can see it in our smiles!


Our mission is to be a world leader in the development and manufacture of the highest quality plastic filament solutions for 3D printing and book binding.


At Coex LLC, our belief system is based on Christian values which are the guiding principles influencing everything we do and how we do it.

  • Fun: Do what you love and have fun doing it!
  • Innovation: Evolving minds meet the needs of a changing world.
  • Leadership: Be a positive example and others will follow your lead.
  • Trust: Trust is an essential building block in successful relationships.
  • Excellence: Don’t settle for anything less than excellence.
  • Respect: People are respectable only as they respect others.


Coex LLC will always develop, produce, and supply exceptional products and services that:

  • Our customers prefer over all other options.
  • Our customers recommend to family, friends, and business associates.
  • Our employees take pride in.
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Bob “Boots” Rutten, Director of Sales and Manufacturing

Bob is the highly-motivated, straight-shooting, tireless leader at the helm of Coex LLC.  He has multiple college degrees and has been working with the owners of Coex for over 20 years now.  His greatest talents are his quick mastery of new technologies, his wealth of knowledge in mechanical engineering and just knowing “how things work,” and most importantly, his innate sense of how to best solve problems.    He will quickly earn your trust through his desire to always treat others how he would want to be treated.   With Bob as leader, Coex guarantees our customers and business partners 100% satisfaction with our products and services.

At work, rest, or play, you will usually see Bob wearing a pair of boots.  After he has earned your trust and respect, you too will be calling him by his nickname “Boots.”  When Bob is not helping to solve a problem, you will find him and his wife, Jill, on a random trail somewhere in Wisconsin or the UP, burning high-octane gasoline in a Ski-Doo product.  Sometimes trails are optional!  They like to call it “picker-diving.”

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Bill Newhouse, Account Manager

Bill has a degree in Forest Management and a Master’s in Business Administration. He brings a wide range of sales and business development experience in the paper, engineering and electrical manufacturing industries. Bill serves as the conduit between the Coex office and its customers. He takes great pride in working directly with customers to ensure that they’re happy with our products and assisting them with new product ideas and capabilities.

Bill’s main goal is to guarantee to our customers that Coex is their partner and that our team is here to help them succeed. In his free time, Bill enjoys exploring the outdoors with his wife, Jeanette. He has a goal to visit all the national parks in the U.S. and travels internationally, when possible, to visit any one of his three grown children.

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Sheri Hartzheim, Office Manager

Sheri is our accountant and much more.  She brings business ownership and management skills to Coex from her past small business ownership experience.  Sheri manages our shipping, receiving, order processing, production scheduling, and website.  If you have any question at all about your order, she is the one to ask!

Sheri’s goal is to give our customers superb service from order intake, through production, to shipping and invoicing.  When she’s not updating our website and crunching numbers, she enjoys spending time with her daughter Nora, crocheting hats, playing ” the dancing usher” at Wisconsin Timber Rattlers games, and watching Brewers baseball.


A dedication to Ashten Saeger

Ashten Saeger was co-owner of Coex LLC before her unexpected passing in 2017.  She was a strong, caring, and compassionate leader who formed the backbone of this company in its infancy.  She took great pride in leading Coex by example, embodying the values upon which this company stands.  With her 1,000-watt smile, infectious laugh, and proclivity for empathy, Ashten had the natural ability to draw people to her as soon as she stepped into a room.  Her positive outlook and optimistic vision for Coex lives on in the members of our team. 

She guides us every day – our “Ashten Angel.”

Our Village encompasses and owns a diverse group of various companies in three complementary competencies; manufacturing, innovation and community service. We are 515 employees strong centered around our common Core Values. Combining each of these market focuses allows us to have a very unique perspective and group of resources to develop innovative solutions, products and experiences that few others can even dream of offering. To that end, these are the four guiding principles we live by: