This is the OpenSCAD source for the acrylic plate and 3D-printed case I used for my merp keyboard. This can be adapted to support a variety of ortholinear keyboards with arbitrary layout sizes and PCB mounting holes -- just read through the first lines of the file that define

Some notes:

• This case is "borderless". This is mainly for aesthetic reasons in split keyboards, where you'd probably want to be able to stick the two halves together without creating an odd gap in the matrix
• The case assumes standard Cherry MX switches on a 19mm gird
• If you are using this for your own keyboard, make sure you have cut out holes for USB, TRRS cables, etc at the correct locations. You can modify the components() module to import a 3D model of your PCB, so you can see if it fits without any issues

Acknowledgements:

I use other people's models for creating the preview of the assembled keyboard:

• Cherry-MX switches from https://bitbucket.org/gcb/3dump
• Keycaps from https://www.thingiverse.com/thing:2178185