What goes on the plate
The revised design includes a 20 mm block, a 40 mm bar, travel towers, a tray and lid, a 10 mm bridge and one mild overhang fin. A 30 mm ramp and a nominal 30 mm sphere add inclined and curved surfaces.
The sphere sits on a permanent collar and pad. Its lower cap is covered by that collar; it is not a test of a completely unsupported lower hemisphere.
Why the design changed
The original Copymaster print included 20 and 30 mm bridges and a steeper overhang ladder. Those features distorted and produced poor unsupported surfaces. They were removed from the routine design because failed strands could interfere with the useful parts.
The original results remain in the measurement record. The revised shapes do not turn those results into measurements of a different test plate.
What stays consistent
For a given comparison, use the same printer, nozzle, layer height, layout and documented profile where they suit the materials being compared. Record the exact product, colour, pack and any change to the setup. Different nominal greys are not identical formulations.
Handling belongs in that record too: printed after opening, previously stored, or dried for a stated time at a stated temperature. We do not measure filament moisture content or assume every reel needs the same drying cycle.
How results are recorded
Measure the named dimensions and the cavity and insert separately. Try the lid without sanding it into a pass. Photograph uncleaned surfaces, seams, strings and failed features under consistent conditions.
Keep failed attempts and waste in the record. Report slicer estimates as estimates, and measured consumption as measurements. The print-record sheet keeps the details together.
What one plate can tell us
Several shapes can reveal useful differences within one print. They do not establish repeatability across separate print runs, different batches or every colour. The practical plate also does not measure tensile strength, hardness or heat resistance.
Those limits do not make the result useless. They define the buying questions it can answer. The score descriptions explain how the relevant observations can be summarised.