Model

This 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 printing one colour.

The Bottom, reset switch, and stylus are single colour only.

How to Use

It seems a little complicated to start, but once you start using it and learn the rules, you can very quickly start doing large additions.

To reset the device.

Hold the Reset-switch at the top in and tilt the device forward until the numbers all show ‘0’.

You can then release the reset switch.

Insert the stylus into the slots next to the number you want to add and drag it to the bottom.

If the slot has a different colour, slide it up to the very top instead, then over to the left and then down.

If you then see a ‘+’, insert the stylus into the ‘0’ position and again move it up, over, and down.

For subtraction, use the bottom half of the device while reversing the rules.

Slide up to subtract numbers, unless the slot is coloured differently, in this case, slide it down, across, and back up.

It does make more sense when you use it.