How to order a 3D part without supports?
ShapelidAdministratorCommunity Expert
Shapelid
I wonder how was your first experience with Shapelid? Did you order a sample part or search parts on grabcad just to give it a try?
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Accepted answer· Accepted by the topic author
To minimize or eliminate support structures, focus on your geometry. Designing for additive manufacturing (DfAM) means keeping overhangs below 45 degrees relative to the build plate. If you must have features like horizontal holes, use "teardrop" or diamond shapes instead of circles; this avoids the need for internal supports and improves surface finish.
If you are aiming for complex geometries without supports, consider switching from FDM to SLS or MJF, where the unsintered powder acts as a natural support. These processes are generally more expensive per part but offer better isotropic properties and allow for tight nesting.
To provide a specific recommendation, I would need to know your intended material, the required surface roughness, and your budget constraints. Wall thickness is critical here; thin walls unsupported by geometry may warp during cooling. Always verify your minimum feature size against the specific technology's datasheet, as capabilities vary significantly between suppliers. If you are prototyping, start with a simple test coupon to evaluate your design's self-supporting capabilities before committing to a final run.
ShapelidAdministrator
Shapelid
@Shapelid AI Can I find parts which don't need any support on a platform like grabcad rightaway?
Finding pre-designed parts on GrabCAD that are inherently support-free is hit-or-miss. Most models there are uploaded for visualization or assembly planning, not DfAM. Even if a model looks printable, it often features sharp overhangs or unsupported bridges that require supports for a clean result.
Instead of hunting for "support-free" files, I recommend taking a simple model and modifying the geometry yourself. Apply these quick fixes:
- Chamfer or fillet any edge under 45 degrees relative to the build plane.
- Replace circular holes with teardrop profiles.
- Bridge gaps by splitting the part into two pieces and adding alignment pins, then join them post-print.
If you are just looking to test the platform, upload a custom-designed test cube with various overhang angles and hole shapes. This allows you to verify how different build orientations affect the support requirement for your specific material choice. Always check the supplier's DfAM guidelines for the selected technology, as the "support-free" limit changes based on the specific printer and material sintering process. You will need to verify your final file's geometry in your slicer to see exactly where the software generates support structures.
You are very welcome. If you decide to proceed with an order, remember that your choice of orientation is the most effective way to eliminate supports. Even a design that seems difficult can often be printed support-free if you rotate it so that every overhang remains within the 45-degree rule.
Before you upload, run your model through your own slicer software; it will highlight exactly where supports will be generated based on the specific machine profile. If you see areas needing support, look for ways to adjust those specific faces rather than changing the entire part.
To give you more specific advice on whether a part is cost-effective to produce, I would need to know the material requirements (e.g., rigid vs. flexible) and the intended application, as these dictate which manufacturing technology we should optimize for. Always check the specific supplier's Design for Manufacturing (DfM) guidelines for that material, as tolerance capabilities and minimum wall thicknesses vary significantly between different printer configurations. When you are ready to move forward, focus on these DfM constraints to avoid unnecessary post-processing costs.
ShapelidAdministrator
Shapelid
@shapelidai hey, are you still there?
To print without supports, your design must follow "self-supporting" geometry rules. Aim for overhang angles of 45 degrees or less; anything steeper typically requires support material unless your machine handles specific materials or bridge geometries exceptionally well. Focus on chamfers rather than fillets for underside edges, as these are much more forgiving for FDM/SLA processes.
To provide specific advice, I need to know the material, your required tolerances, and the intended application. Cost drivers for unsupported parts often shift toward build orientation—optimizing the "Z-axis" layer direction can eliminate the need for supports but might increase build time or affect surface finish.
Always verify the specific machine’s capabilities with your chosen supplier. Every printer has unique cooling performance and extrusion constraints, so what works on one machine may fail on another. If you have the CAD file or a screenshot, share it; I can point out which features are likely to sag or deform without scaffolding.
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