Using the Chamfer/Fillet tool, you can create two different types of fillets: basic and circular. The basic fillet is a simple, curved transition between adjacent surfaces or faces. On the other hand, the circular fillet is a similarly rounded transition based on specific radii. 

In the app, the default circular fillet type is a rolling ball with G1 surface continuity, but you can fine-tune the circular fillet by adjusting the corner and continuity types:

• Rolling Ball: To understand rolling ball, imagine rolling a ball along two adjacent surfaces or faces so it simultaneously touches those surfaces or faces. The ball creates a path with a single constant radius – that rounded path is the fillet.
  
• Setback: This type of corner is created from a curved surface with a variable radius, which means two edges have two or more different constant radii.
  
• G1: This is a type of surface continuity that’s formed when two surfaces or faces share an edge and the tangent plane is equal for both surfaces or faces.
  
• G2: This is a type of surface continuity that’s formed when:
  • G1 continuity exists;
  • The rate at which the curvature changes along the shared edge is equal for both surfaces or faces.
    💡Note:💡 If you’re subscribed to the Business plan, you can use this setting.
    

Follow these steps to fillet edges:

1. Select the edges you want to fillet.
   Make sure the blend type is set to “Auto.” 
   
   If you select a face or body, all connected edges will be automatically selected. 
2. Pull the selected edges to blend them. The fillet size is a positive value.
   
   You can select the dimension label to define exact values of the fillet. If you’re using a mouse or trackpad with the iPad, type in the exact value and press the Return key to finalize the dimension.
3. Move the slider to adjust the fillet's curvature.
   
4. Tap the Gear icon to customize the fillet corner (Rolling Back or Setback) and the surface continuity (G1 or G2).
5. Tap the design space to finalize the fillets. 

Adjust fillets

You can always fine-tune the fillet by selecting the filleted edge and changing the dimensions. Once you fillet an edge, you cannot change it into a chamfer without completely deleting the fillet, and vice versa. To delete it, just select the filleted face and select Delete or press the Delete key. 

💡Shortcut💡: If you select the edges first, the menu is customized automatically. From this adaptive menu, go to Chamfer/Fillet. 

When you're done blending the edges, tap anywhere in the design space to confirm the change.