Hi!
At the very beginning I’d like to point out that I’m new to the world of rhino and I’ve been using it for a few weeks. I come with a question and a request to point out where I’m making a mistake. I’ve started modeling a lamp for 3d printing, but I noticed that not every geometry combines well into a whole model using the “join” command.
When the model is divided into parts, the geometry displays well, but when it is joined, triangular geometry connections are created, which can be seen in the monochrome and render display port. What am I doing wrong and how can I solve this problem?
This might just be a display issue. You can check the render mesh settings in the options under ‘Mesh’.
If that does not help, upload your file.
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Problem solved! Thank you so much, and have a nice day sir! 
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Was it the render mesh?
If so, please click the solution button in my post above so other users know this topic is solved.
unfortunately not. Still doesn’t solved display issues. At first signt it helped but still it doesn’t display the mesh properly. I’m sending a 3dm file for you to check it. Thank you for your time and willingness to help me!
Please check the shaded and monochrome display. In shaded view everything is fine, but it doesn’t display it properly in monochrome view
3d lamp joining problem.3dm (2.2 MB)
