I have a strange recurring issue with exporting files. If I export some geometry as STEP and then re-export it with the same name, overwriting the previous file, Rhino will often lock up for 30 seconds to a minute.
Steps to reproduce (Windows, Rhino 8, 8.25.25314.11001, 2025-11-10)
Create any NURBS geometry
Select it and choose File > Export
Select STEP format, give it a name, save
Select the same geometry again, File > Export again
Select STEP format
Click on the previously exported file to set it the same name
Save file, approving overwrite
Rhino will now lag for 10s of seconds to minutes writing the STEP, even though the first export was instant.
It doesn’t happen every single time for me, but I’ve experienced it dozens of times now across many files for months. I have attached the file I was working on that did it just now, which prompted me to make the post.
Hi @phizz
Just tested this on both your file and one of my own files - no problems at all. Both exports were instant. Are you saving locally? If not, try saving to the Desktop (or similar) to see if that’s better. It might be your online storage (Dropbox, iCloud, OneDrive etc.) causing the lock-up.
-Jakob
I’ve been saving locally, to my desktop. Desktop is the regular local folder, not the OneDrive version or anything like that. It also doesn’t happen for me every time; I’d say one time in four, and seemingly at random. Sometimes it will happen four times in a row, sometimes not at all for a given file.
I wonder if it’s not a Rhino issue at all, but rather something like Windows failing to give up the handle on the previously saved file. Is there a log I could look at the next time this happens to get a hint?
It’s not a critical bug, but it is just annoying enough that I want to figure out what’s going on.