You always own a full license to do nearly anything you want within reason with your own models, being part of the exclusive program just voluntarily restricts your ability to upload the raw model files to be distributed, you always own full commercial rights to sell physical prints of any models you design (subject to owning the IP’s involved, you still can’t legally sell a Disney model you made etc) and as i understand it, Portal is basically a print on demand service, so they just print and ship the finished product and the client doesn’t ever see the 3D model files and as Portal doesn’t distribute the model files they wouldn’t count against the model exclusivity you gave bambu