Prepare lighter parts by creating controlled internal hollows that reduce material usage without changing outer design intent.
Hollowing workflow
Upload an STL and define the shell
Hollow solid parts strategically to cut weight and material usage while keeping outer geometry intact.
This tool currently accepts STL only. For any other file type, use Convert 3D File first.
FileNo file selected
Triangles--
Bounds--
Original volume--
Preview the estimated shell behavior, inspect a live section view, and review the generated STL before moving into production decisions.
ReadyUpload an STL to inspect the part and estimate hollowing.
Preparing part...0%
No hollowing result yet
The result panel will show volume savings, shell details, and any manufacturability warnings.
Original Volume--Remaining Material Volume --Material Saving--Shell Thickness--
Cross Section
Inspect the internal cavity
Run hollowing to enable section view
No hollow section yetRun hollowing to inspect the internal cavity, shell spacing, and section behavior through the part.
Section insights
Run hollowing to inspect the internal shell section.
Hollow observations
Upload an STL and generate a hollow shell to inspect internal behavior.
Warnings
0
No warnings yet.
Why Hollow 3D Printed Parts?
Hollowing a 3D model creates an empty interior cavity, significantly reducing material usage, part weight, and printing cost. This is especially valuable for SLA resin prints and SLS nylon parts where material cost is high. A properly hollowed part can cost 40-70% less than a solid version while maintaining structural integrity.
When to Use Hollowing
Decorative models — Figurines, display pieces, and visual prototypes that do not need solid strength.
Cost optimization — Large parts where material cost is the primary expense driver.
Resin printing — SLA parts should typically be hollowed with drain holes to save resin and reduce print time.
Upload your STL file above to hollow it for free. Then use our wall thickness checker to ensure walls are strong enough, or get a quote for professional 3D printing.
sushant@iamrapid.com
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