I used MakerGeeks dishwasher-safe high-temp PLA at 230ºC. A bit more flexible that standard PLA, but seems like a solid mount. Initially the top mount was one piece with one split. The PLA I used flexed enough to get around the tool, but standard PLA probably would have broke so redesigned it.
Needs seven (7) sets of 6-32 x 3/4" screws with lock nuts--four sets to mount to the tool base, and three sets to hold the tool.
Still assembling my MPCNC, so in theory, the HF cutout tool should work for basic stuff.