Disappointed that your GDP186 desktop dry erase pad only came with a single drawer, when it very obviously could fit two? Print another one!
Printing
Printed with supports on build plate (for the handle overhangs) in Inland PLA. I used 3 walls and 10% infill at 0.2mm. It would be fine with standard 0.2mm or 0.3mm layer height settings. Drawer
GDP186_drawer.stl is a faithful rebuild of the original drawer shape, minus the internal dividers. If you just need another drawer, this is the one for you.
Gridfinity Drawer
I recommend the GDP186_drawer_gridfinity_centered.stl file!
The back grid sets fit up to 3U tall Gridfinity boxes. 4U might fit - but will be tight at the front. This is best used for boxes that store their items entirely internally - items that stick up will prevent the drawer from hiding under the surface. The front grid slots are pretty short - 1U at the front.
There is an option to not center the grid, which leaves some open space on the right. If you have a specific use for that space, go for it.
Customization - OpenSCAD
Parameters for all dimensions are available in the GDP186_drawer.scad file. You'll need two libraries to get this to build: