Tips & Tricks: Filling Loops on a Part Mold

Written By: Bettina Giemsa
  • 9/9/2016

We recently looked at some of the powerful part mold analysis tools that are available in Creo Parametric. In this tip, we’ll show you how to fill loops on a parting line. If you’re working with a reference part in a mold assembly that contains holes, you need to cap them before you can split the mold. Here’s how:

  1. Hide the workpiece so you can collect surfaces on the reference part efficiently. To do this, in the Model Tree, right-click the work piece and select Hide from the pop-up menu.

  1. On the reference part, locate the holes that need to be capped.

Holes to be capped to prepare to split the mold

The holes within the red circles need to be capped in order to split the mold.

  1. On the Parting Surface tab, click Shut Off.
  2. Select individual surfaces around the hole(s).

Part with surfaces selected

Select the surfaces around the hole.

  1. On the Shut Off menu bar, select the check box titled Close all internal loops.
  2. Select the Accept (check mark) button to apply the changes.

Part shown with holes capped

The holes are now capped (shown in orange).

To see a demonstration of these steps, check out this video on PTC Univerity’s Learning Exchange.  You may need to create a PTC University Learning Exchange account if you don’t already have one. But the good news is that with a login, you’ll have access to hundreds of in-depth demonstrations and tutorials for PTC products. 

To learn more, read the Creo Help Center page, About Filling Loops in a Parting Surface.

Keep Up with Creo!

Interested in more tips and tricks, as well as PTC Creo news, customer stories, and more? Subscribe to PTC Express, our e-newsletter, for regular updates.

Subscribe to PTC Express


  • CAD
  • Retail and Consumer Products
  • Connected Devices

About the Author

Bettina Giemsa

I graduated from Ruhr University in Bochum, Germany, with a Master of Arts in American Studies, Japanese, Economics * Started my career in Marketing on the agency side, spending almost 3 years in media planning * Ran Marketing at ITEDO Software GmbH, Germany from 2001-2006 where I first got in touch with the CAD business * Became part of the PTC Marketing organization when ITEDO was acquired by PTC in October 2006 * Currently, I work in PTC Customer Success, focusing on PTC University’s global Marketing program. Last, but not least, I am the mother of 2, enjoy running, riding and rock music among many other things.