DeltaTestObjects

I've added a quick version using the round one in the note below.
AND I've modified that one too :)
With just the arcs and not a continuous rim, there are sometimes bumps at the ends that mess up the measurements so here is one without the gaps. The picture shows the earlier one with gaps.
As I can easily take the build plate off for measurements, there was no need for it to hold together. This quick one makes multiple readings for adjustments much faster and uses less filament.
Also, the