When I import an assembly STEP (stezni_pribor_asm.stp) into Creo’s Part mode (File > Open > .stp, Type = Part, Import type = Geometry), the resulting part has wrong geometry: some solids in the STEP file come in as open quilts, some components are missing, and the rest overlap.Creo reports: Warning: Importing assembly in part mode. Geometry may be wrong.WARNING: One-sided edge found in IMPORT FEATURE. WARNING: Unattached IMPORT FEATURE was detected. WARNING: Unattached IMPORT FEATURE was detected. WARNING: Feature creation resulted in overlapping part geometry. Warning: Design intent is unclear. Use Geometry Checks command on the Tools Tab for more information.The same file imported with Type = Assembly comes in perfectly - every solid component comes as a solid, correctly placed. I have attached the step file and screenshots of both imports - the same STEP file imported as a Part, and imported as an Assembly for reference.Questions:1. Is Part mode supported for an assembly STEP, or is the geometry expected to degrade whenever this warning appears?2. Is there any setting - import profile option, accuracy, config option - that makes it import reliably as one multi-body part?STEP file imported as an Assembly:STEP file imported as a Part:

KA_14620447

4-Participant

Question

Assembly STEP imported in Part mode — wrong geometry (Creo 11.0.6.0)

Forum|Forum|16 hours ago
September 25, 2026
3 replies
35 views

When I import an assembly STEP (stezni_pribor_asm.stp) into Creo’s Part mode (File > Open > .stp, Type = Part, Import type = Geometry), the resulting part has wrong geometry: some solids in the STEP file come in as open quilts, some components are missing, and the rest overlap.
Creo reports: Warning: Importing assembly in part mode. Geometry may be wrong.

WARNING: One-sided edge found in IMPORT FEATURE.
WARNING: Unattached IMPORT FEATURE was detected.
WARNING: Unattached IMPORT FEATURE was detected.
WARNING: Feature creation resulted in overlapping part geometry.
Warning: Design intent is unclear. Use Geometry Checks command on the Tools Tab for more information.

The same file imported with Type = Assembly comes in perfectly - every solid component comes as a solid, correctly placed. I have attached the step file and screenshots of both imports - the same STEP file imported as a Part, and imported as an Assembly for reference.

Questions:

1. Is Part mode supported for an assembly STEP, or is the geometry expected to degrade whenever this warning appears?

2. Is there any setting - import profile option, accuracy, config option - that makes it import reliably as one multi-body part?

STEP file imported as an Assembly:

STEP file imported as a Part:

stp.zip

StephenW

23-Emerald III

To bring a step assy in to creo as a single part, you need to add the hidden config.pro option intf3d_in_as_part yes

See the link for extended discussion.

StephenW

23-Emerald III

There is a little more discussion in this post about “hidden” config.pro options also

KenFarley

21-Topaz II

Looks like all the pieces that are correctly located in the assembly are conglomerated together when you attempt to read them is as a part. Instead of being positioned where they are supposed to be with respect to the assembly they are grouped around their default coordinate systems. I seem to remember seeing this behavior with models we received from a customer.

Here’s a past discussion of this that might help:

https://community.ptc.com/3d-part-assembly-design-327/assembly-step-import-position-placement-of-items-26644

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