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Green Sand Metalcasting Foundry News

Webinar Describes Green Sand Metalcasting Foundry 3D Printing of Cores

Posted by Hill and Griffith Company on Aug 23, 2016 3:29:50 PM

(This week's post highlights some of the new capabilities of 3D printed cores. The webinar is from the American Foundry Society and part of their MCTV, Published June 1, 2016.)

Introduction to 3D Sand Printing for Metalcasting

"This sponsored webinar from Hoosier Pattern covers the basics of additive manufacturing as well as explains the technology used to create molds and cores with a 3D printer. Led by Dave Rittmeyer and Steve Murray, both of Hoosier Pattern, the webinar gives full access to two industry veterans who have worked in metalcasting for a combined 50 years. The webinar covers the basics and explores how to utilize 3D printed sand components on your next project.


  • Background of 3D printing in general
  • What you need to use 3D sand printing in your foundry
  • How to apply what you have learned about 3D printing for your foundry needs


Time Condensed Technologies

  • Vat photo polymerization (SLA, DLP, 3SP, CLIP) 
  • Sheet lamination (LOM, SDL, UAM)
  • Material extrusion (FDM, FFF)
  • Powder bed fusion (SLS, DLMS, SLM, EBM, SHS, MJF)
  • Material jetting (Polyjet, Projet, SCP, MJM)
  • Directed Energy Deposition (LMD, LENS, DMD)
  • Binder jetting 



  • A single core is printed versus assembled cores
  • Cores can be hollow and contain unbound sand
  • You can create risers that help metal get into the mold versus getting the cores in the mold
  • Fast cores creation because drafts are not required to be applied to the 3D model.
  • Only the creativity of the foundry engineer is the limiting factor



  • What's the best process to replace a wood pattern? They compare CNC versus Material extrusion
  • What type of sand do you use? 83 GFM round silica sand.
  • What are size limitations? None, assembled like Legos of 1500 pound blocks of sand. Small details require other methods. 80-inch square mold have been created.
  • Shrinkage? Same as what the foundry uses as added shrink.
  • Time to obtain a printed sand mold or core. They can build a job box full of parts per day. Typical two week delivery time.
  • What is surface finish? 2-300 RMS. 15-degree angle is the worse.

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The Hill and Griffith Company's green sand metalcasting foundry supplies help achieve the EPA's M.A.C.T. standards and reduce Benzene emissions. Our variety of environmentally sound release agents, coatings, partings, lubricants, core oils and specialty products will help you meet your metal casting's needs. We're known for our hands on approach. Let us visit your plant and recommend products that suit your needs.

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