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Elaine is right that both ChimeraX and old Chimera have hollow ribbons and if you clip them you see inside.  Your first image looks like a tube (ChimeraX command "shape tube #1@CA" which is not an actual ribbon but just a tube surface.  Hollow surfaces are capped.

        Tom


> On Feb 27, 2026, at 9:05 AM, Elaine Meng via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:
>
> Hello Eliane,
> Sorry no, I can't think of any way to cap the ribbons so that they look solid instead of hollow.
>
> However, I believe this is the same in Chimera and ChimeraX.  Looking at both programs right now, when I slice the ribbon it appears hollow.
>
> Best,
> Elaine
> -----
> Elaine C. Meng, Ph.D.                      
> UCSF Chimera(X) team
> Resource for Biocomputing, Visualization, and Informatics
> Department of Pharmaceutical Chemistry
> University of California, San Francisco
>
>> On Feb 27, 2026, at 3:18 AM, Eliane Hadas Yardeni via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:
>>
>> Hello,
>>
>> Recently I downloaded the new version of ChimeraX and noticed that in the ribbon style the helices now look hollow. In the older version of chimera, the helices were capped. Is there a way to cap the helices in the new version?
>> Below is an example from the old version and the new version:
>>
>> Old:<image.png>
>> New:<image.png>
>> Thank you for your help.
>>
>> Best,
>> Eliane
>
>
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