Why Your Model Won’t Cap in Rhino 3D (Negative Edge Fix)
8K views · 2026-03-26
Industrial Design
This week, a student asked me:
“Why won’t my model cap?”
The issue wasn’t the cap command.
It was the starting curves.
In this Rhino 3D Jewelry CAD tutorial, I explain how negative edges and non-flat curves prevent successful capping.
We fix it by:
• Making sure curves are flat
• Ensuring they are fully closed
• Using a straight line to clean the edge
• Trimming properly before capping
• Creating a flower petal using the polar array technique
Sometimes the problem isn’t the tool — it’s the foundation.
If you’re learning Rhino 3D, Jewelry CAD, or surface modeling, this small adjustment will save you hours.
Follow this channel for practical, production-focused CAD education.
#Rhino3D #JewelryCAD #SurfaceModeling #CapSurface #3DModeling #CADTutorial #RhinoTips
📚 Want to Learn More? Check Out My Online Courses:
🎓 Jewelry CAD Masterclass – Intro to Intermediate- https://pjs-school.thinkific.com/courses/jewelry-cad-design
🔥 Mastering Signet Ring in Rhino 3D- https://pjs-school.thinkific.com/courses/signet
💎 Stone Setting in Rhino 3D- https://pjs-school.thinkific.com/courses/StoneSettingModeling
🔗 Clasp Design in Rhino 3D- https://pjs-school.thinkific.com/courses/ClaspModel
🌀 SubD Modeling for Jewelry- https://pjs-school.thinkific.com/courses/subdrhino7
✨ Join Our Community:
📩 Signup Newsletter to download the stone file at https://mailchi.mp/f3d9b32b0552/stone
📌 Recommended Playlists for Beginners:
Rhino 3D for Beginners- https://www.youtube.com/playlist?list=PLXeFqCRRSA3hxBLOTLwYyszR6AFIsNf3S
Stone Setting Tutorials https://www.youtube.com/playlist?list=PLXeFqCRRSA3ikv46eSfgHGxVFG0Z8NByA
Most Common Rhino Questions https://www.youtube.com/playlist?list=PLXeFqCRRSA3h6WOmntq_k6vrydTCKNjfd
🔔 Don’t forget to subscribe for weekly Rhino 3D tips & tutorials: https://goo.gl/MJ4ExU
📧 Business inquiries: pj@pjchendesign.com
#Rhino3D #RhinoTutorial #JewelryDesign #PJChenDesign
“Why won’t my model cap?”
The issue wasn’t the cap command.
It was the starting curves.
In this Rhino 3D Jewelry CAD tutorial, I explain how negative edges and non-flat curves prevent successful capping.
We fix it by:
• Making sure curves are flat
• Ensuring they are fully closed
• Using a straight line to clean the edge
• Trimming properly before capping
• Creating a flower petal using the polar array technique
Sometimes the problem isn’t the tool — it’s the foundation.
If you’re learning Rhino 3D, Jewelry CAD, or surface modeling, this small adjustment will save you hours.
Follow this channel for practical, production-focused CAD education.
#Rhino3D #JewelryCAD #SurfaceModeling #CapSurface #3DModeling #CADTutorial #RhinoTips
📚 Want to Learn More? Check Out My Online Courses:
🎓 Jewelry CAD Masterclass – Intro to Intermediate- https://pjs-school.thinkific.com/courses/jewelry-cad-design
🔥 Mastering Signet Ring in Rhino 3D- https://pjs-school.thinkific.com/courses/signet
💎 Stone Setting in Rhino 3D- https://pjs-school.thinkific.com/courses/StoneSettingModeling
🔗 Clasp Design in Rhino 3D- https://pjs-school.thinkific.com/courses/ClaspModel
🌀 SubD Modeling for Jewelry- https://pjs-school.thinkific.com/courses/subdrhino7
✨ Join Our Community:
📩 Signup Newsletter to download the stone file at https://mailchi.mp/f3d9b32b0552/stone
📌 Recommended Playlists for Beginners:
Rhino 3D for Beginners- https://www.youtube.com/playlist?list=PLXeFqCRRSA3hxBLOTLwYyszR6AFIsNf3S
Stone Setting Tutorials https://www.youtube.com/playlist?list=PLXeFqCRRSA3ikv46eSfgHGxVFG0Z8NByA
Most Common Rhino Questions https://www.youtube.com/playlist?list=PLXeFqCRRSA3h6WOmntq_k6vrydTCKNjfd
🔔 Don’t forget to subscribe for weekly Rhino 3D tips & tutorials: https://goo.gl/MJ4ExU
📧 Business inquiries: pj@pjchendesign.com
#Rhino3D #RhinoTutorial #JewelryDesign #PJChenDesign