20cm Alignment Grid / Craft Cutting Board

This is a simple 20cm x 20cm (200mm x 200mm) grid I designed. I needed a flat surface I could quickly align things on that was more durable than a paper grid. I'm sharing the design in case someone else finds it useful. I mainly use it for aligning items on a laser engraver, and the grid lines would probably make good guides for cutting straight lines with a craft knife.

To state the obvious, it's divided into 1cm x 1cm squares, with emphasis lines every 5 cm.

When I printed it, fortunately there was no material shrinkage and the accuracy is almost perfect. I printed with Hatchbox PLA, with a bed temperature of 50C and hot end temperature of 200C on a Creality Ender 3. Different materials or printing temperatures will probably affect material shrinkage and the accuracy of the grid size.

UPDATE 2/20/2020 : I replaced the original stl file with the same model at a lower resolution. The high quality model was almost 8 MB and the lower resolution version is only 1 MB with no significant change to the final result.