<p>Is there any software/methods to automatically splice objects into multiple pieces sort of like a jig saw puzzle so that I can combine them together and bypass the build plate size limit?</p>

<p>As an example I have this 2D image that I want to print out but my printers size limit is roughly the size of the blue "squares." It's pretty tedious and time consuming to do this manually. Also, any tips on getting seamless lines or proper alignment when gluing these pieces together are appreciated.
<a href="https://i.stack.imgur.com/uw7Kg.png" rel="noreferrer"><img src="https://i.stack.imgur.com/uw7Kg.png" alt="enter image description here"></a></p>

From what I understand, you're trying to partition your object into smaller pieces with the hopes of putting them back together in a manner similar to a Jigsaw puzzle.
There are two options that I know of to do this, which requires using OpenSCAD:
The
PuzzleCut
library - This allows you to disassemble your object into a multiple pieces that can be assembled together in a jigsaw puzzle type manner
The
PinCut
library - This allows you to disassemble your objects into multiple pieces that than be reassembled using the pins and corresponding holes on the pieces.