Due to the change of the Netfabb cloud service to MS 3D tools with the new file format 3mf I´m forced to look for a 3mf viewer for Mac OS. Unfortunately Netfabb free 7.4 doesn´t load the fixed files because of an zip error (#1035). Does anybody know an alternative to Netfabb that can open and view 3mf files?
Did you try unzipping and rezipping your 3mf file? It might help netfabb open up the 3mf file. I don't know of any other 3mf reader for Mac OS X.
Cura software will open 3mf files and save in a different format if wanted. It is used by their Ultimaker 3D printer for viewing and slicing the model into gcode. Available for Windows, Mac OS10 and Linux. https://ultimaker.com/en/products/cura-software http://www.3mf.io/adoption/