at the last lab I worked at, we mildly brushed off the pucks prior to removing from miller (helps to keep miller arm clean to prevent retaining screws from stripping/locking on). Then the disks were put in a sandblasting cabinet (repurposed to contain the zirconia dust) to be blown off with...
Nobel NP...I believe, but may be a zimmer though...a picture of the top of the screw may help a bit more
https://store.nobelbiocare.com/us/en/instruments-and-accessories/cover-healing-screws
Considering the price, the build plate is way too small. We utilize it for printing models for our 'digital' doctors. The Varseo S build plate is only 30% bigger, by comparison. It has been a headache to keep the machine functioning properly...