Bottom layer for an Iris PE keyboard. It's tented at 12 degrees.

I printed it in PETG with 15% infill and it feels plenty sturdy and doesn't slide around on my desk mat. If you're using it on a smooth surface, you probably want to put some of those adhesive nonslip feet on it.

Nothing too fancy, I just took the bottom layer design from the Keeb.io GitHub repo and put some feet on it. Just unscrew your bottom layer and replace it with this one.

The Fusion files are included as well. I just used a plane at a 12 degree angle and extruded the feet to meet it. Should be easy to change if you want a different angle, longer feet, etc.