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Three Reasons for Using SLDPRT Files Instead of STL for 3D Printing

By Andrew Sink on August 6, 2021

When you first put an STL file next to an SLDPRT file in GrabCAD Print, you might have noticed it can be difficult to tell them apart. However, looks can be deceiving, and the native SOLIDWORKS SLDPRT file format packs a surprising amount of functionality into a 3D model. In this blog post, we are going to dive into the three primary reasons you should be using SLDPRT files instead of STL for 3D printing.

Importing Faces and Curves

An STL file is composed of a series of points that are used to create triangular faces. These faces mesh together to make a 3D model which historically has been very difficult to modify. When you import an STL file into SOLIDWORKS, you can see the triangular mesh lacks any real addressable surfaces or curves. Unlike an SLDPRT file, it’s not possible to select a surface or curve on this model in GrabCAD Print. This makes adjusting infill and wall thickness a less granular setting. When importing an SLDPRT file into GrabCAD Print, each individual face and curve can be individually addressed to selectively add infill and wall thickness for complex parts.STL_SLDPRT Importing Faces and Curves

If you’re interested in learning how to edit a mesh manually in SOLIDWORKS, you can read our tutorial and see the accompanying video on the TriMech blog.

Importing Color Information

Color can be a critical part of the design communication process. The ability to add color in SOLIDWORKS to a solid model makes this process simple without requiring any third-party modeling programs. Simply applying a color to a face in SOLIDWORKS and saving the file are the only steps required to export a model with color. When imported into GrabCAD Print, the SLDPRT file will automatically have the color mapped to each face and can be printed in full color using Stratasys Polyjet 3D Printing technology.STL_SLDPRT_Importing Color Information

If you’re interested in learning how to apply colors to a model in SOLIDWORKS, you can read our tutorial and see the accompanying video on the TriMech blog.

Simplifying Version Control

STL SLDPRT-A_BTestIf you’ve used a 3D printer before, you probably have a folder filled with STL files labeled “Part_Final.STL”, “Part_Final_Fixed.STL”, “Part_Final_Fixed_MK2.STL”, etc. These outdated STL files can cause serious confusion when finalizing a part for manufacturing. Reducing the size of this folder can increase efficiency. By using the SLDPRT file format, simply saving the file will automatically update the current model, so you can create multiple configurations for testing without having to save multiple models. Simply activating the configuration and dragging it into GrabCAD Print will load the latest model allowing you to do A/B testing without requiring exporting multiple files.

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