Import stp to cubit issue

Coreform Cubit Importing/Exporting
#1

I exported a design from AutoCAD as a .stp (STEP) file that contains 17 solid volumes. However, when I import it into Coreform Cubit, only 15 volumes appear. I also see two black regions in the model that I can’t select or interact with — it seems they didn’t import as valid volumes.

Here’s what I’ve tried so far:

  • Imported using import step "filename.stp" heal
  • Checked geometry count with list volume and list body
  • Attempted to heal geometry all and stitch surfaces all tolerance 1e-6

Still, those two missing parts remain black and non-selectable.

Has anyone encountered this is

Screenshot from 2025-10-12 22-10-03
Screenshot from 2025-10-12 22-10-031203×749 44.1 KB

sue before? Could it be caused by open surfaces or non-manifold geometry from AutoCAD? And is there a recommended workflow or setting to ensure all solids import correctly as volumes in Cubit?

Thank you in advance!

#2

Hi @fakhar,
could you please share the step file. I would like to take a closer look.

#3

4LFA_3D_Solid_with_name_of_materal.step (683.4 KB)

#4

Hi @fakhar,
which Cubit Version are you using?

I got no issues importing all 17 volumes in Cubit 2025.8.

image
image1335×756 59.3 KB

#5

also , i use 2025.8 trial for 30 days

#6

download
how i can make this this design like this , but still i have issue black and sole volume not importing

#7

can i give you anydesk to check my problem , and help me , i want your help

#8

Hi @fakhar,
for non-commercial users only the forum is available for support.

Which OS are you using to run Cubit?

#9

Ubuntu 24.04.2 LTS, this is my os on vmware workstation

#10

works fine if i run it on my Ubuntu 24.04

image
image1368×719 102 KB

have you already tried to run cubit not in a vm?

#11

NO , i’m not tried that