The 3D content cannot be viewed in the browser, but must be downloaded and viewed in Adobe Acrobat. After opening the PDF in Acrobat, a dialog at the top warns, “3D content has been disabled. Enable this feature if you trust this document.”. From the Options drop-down, select “Trust this document always”, then click the small square containing a “?” character in the upper left corner of the document. After a short delay, the 3D content will render in the document window.
Thank you for the feedback. Instead of pdf, we now offer 3D board model in a standard .STEP format which can be opened in a variety of CAD programs, such as CAD Assistant (CAD Assistant - Open Cascade).