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Albiet the default publishing selection on Thingiverse, I do not think it's a bad idea to publish designs on Thingiverse in this manner. The designer is simply asking people who print his or her well thought out design to do so in a non-commercialized manner unless of course with the designers approval.
Asking designers to publish their designs here so that anyone can pursue commercial distribution for them without permission, attribution and/or financial compensation will result in fewer designers publishing their designs here or anywhere else for that matter, whereupon which we all lose their collective creativity. As there are thousands of well thought out and useful designs on Thingiverse by very creative people, why would anyone want to take from their creativity for personal and/or corporate financial gain without permission, attribution and/or financial compensation?
I am simply stating my point of view and not attempting in any way to be argumentative.
And by the way, it is an elegant design walter, kudos.