Well - just a hint to the german regulations.
Design can be protected through "Geschmacksmuster" only.
The rules: The design has to be NEW and need special aspects to distinguish it from other designs.
The protection is for 5 years, can be extended to 5 more years by paying special fees every 5 years.
The maximum protection is possible for 25 years only.
A new "Geschmacksmuster" is not possible, because after 25 years it is not more new (one of the basic rules).
So if there has ever been a "Geschmacksmuster" for it, it is expired and can not be renewed.
A design can not be protected with a trademark, this can be done for names and slogans only or pictures like logos or combinations.
So the name Sinclair or ZX80 could be a trademark but the reproduction of the case could be done without a name on it.
So there is no hurt of a trademark possible.
If any user wants to put a logo on it he could do it himself.
This has nothing to do with the design or the production data for shapeways.
The regulations are EU wide, a "Geschmacksmuster" can be used either in the local country or in the european union.
The duration of protection is same as in Germany.
More information here:
http://www.dpma.de/geschmacksmuster/faq/
So there can not be an active protection now anymore.
Standby alert 