3D modeling threads in OnShape

Published on 2026-04-18

OnShape1 offers two types of tools for drawing threads: hole and external thread. They are great when you draw parts because the tool links the information in the CAD model to the drawing with the right information. The only downside is when you start to design parts for a 3D printer, OnShape1 defines the surface as an internal or external thread but it doesn't represent it in the 3D model. In some cases, the thread will be 3D printed so it needs to be represented as a 3D object in the model.

Here comes a great tool called ThreadLab, developed by antlu56.

Installation

  1. In the toolbar, click on the button Add custom features

Add custom feature
Add custom feature

  1. Past the FeatureScript link in the URL area: https://cad.onshape.com/documents/5c0528b62c1fbb13a2a0e739/w/9f9185ce078357d93c7d0853/e/7cbb452d4d5e963a034ce616
  2. Click on the module name in the list

Select the module
Select the module

Usage

  1. Draw a hole for an internal thread or a cylinder for an external one
  2. Select the desired hole or cylinder

Internal cylinder selected
Internal cylinder selected

  1. Open the ThreadLab tool
  2. Configure the thread as needed. For 3D printing, don't forget to select the tab Modeled to have the thread modeled on the part.

External thread
External thread

  1. OnShape is a CAD software developed by PTC↩