Issue
Tobe Builder may fail to convert BIM models when they are too large or complex (geometry and/or properties).
The system will automatically retry up to 3 times
If unsuccessful, you will see:
“Some BIMs cannot be reloaded – conversion retry limit reached”
Models could not be converted after repeated retry attempts
Common Causes
Excessively detailed geometry (e.g. nuts, bolts, small components)
Very large model file size
Complex property data
Heavy federated models (NWD files)
How to Fix
1. Split the Model
Break the model into smaller, logical parts before uploading
✔ Improves processing reliability
✔ Reduces memory and conversion load
2. Use NWC Instead of NWD
Avoid large NWD (federated) models
Export and upload NWC files instead
✔ Lighter and more efficient for conversion
3. Remove Unnecessary Geometry
Open the model in Navisworks and hide elements not required, such as:
Nuts and bolts
Small fittings
High-detail components
Important:
Hidden items are ignored by the converter, reducing complexity.
4. Re-upload a New Revision
After simplifying the model:
Upload a new version to:
Autodesk Construction Cloud (ACC), or
Local file source
Trigger a fresh conversion attempt
Best Practice
Keep models lean and purpose-driven
Remove unnecessary detail before upload to maximise conversion success.
Quick Checklist
☐ Model split into smaller parts
☐ Using NWC instead of NWD
☐ Unnecessary geometry hidden
☐ New revision uploaded