Slide calculator - Addiator - With split face for Subtraction and Addition

ModelThis tool is a larger version of the mechanical calculator. Or as commonly known, the Addiator.The split face allows for the performing of addition and subtraction at the same time. Need to add or subtract some numbers?Now you can add and subtract numbers like all the really cool people did in the olden days. I believe devices like this came out around 1920, so over 100 years ago. I found this device when deep in a YouTube session and was keen to see it working.I have another version available that is a little smaller, but it will only perform addition. This version can do both addition and subtraction, but is a little larger to print. Printing This print was created for multi-colour printing with an AMS, you can modify the colours as needed.If you are importing the STL files individually, load all the files starting with TOP, which will then group the model correctly.Repeat the same for the SLIDE. I've also included a single colour, pre-combined, SLIDE and TOP if you are just pri