Communication was great. Seemed like there were some issues with printing, they were nice enough to also send the failures along with the working ones. However it did look like one failed twice and was left at that. Other than that, wasn't much of any issues.
Unfortunately, although apparently well produced, the cap does not fit my NCVT-3 tool. Whether this is a printing or a design issue I am unsure, but either way, as a first experience of 3d design/printing, this has been less than satisfactory.