Expanding helping objects on printing surface

idea is really simple: you need several things which not many 3d printing softwares can do: you need measuring ruler in all 3 dimensions, you need simple objects without 3d modeling, you need helping hands on 3d printing surface.
All you need is this package which will surely grow during time. If you have any new idea, feel free to share in comments.
This pack contains:
simple cube 1x1x1mm- idea is that, when you need precise measurement on printing table that you expand (scale) that cube in proportion which will help you measure that. For instance, when you need to measure 26,5mm into Z axis, you expand cube on number 26,5 into z, so you will know how tall something is
simple roller 1x1x1mm- does the same thing, but its a roller, you can measure diameter of stuff with this
empty cone- imagine if you need to support some really tall and thin object, to not fall from printing surface, but you cannot turn on support because it will support stuff which is not supposed to support. t