Laser Cut Project Boxes and T-Slot Joints

For Pokemon X on the 3DS, a GameFAQs Q&A question titled How do you unlock the third slot for the Friend Safari?

6060 Aluminum & Hybrid Spoilboard for PROVerXL 4030 XY-Axis Extension Kit, T-Slot Table · Aluminum Table · Hybrid Table

slot game supplier Semi related: is the slot is just the name for the space between the X and Y receiver?

slot games not on gamstop XY-V17B MP3 Player Board Module UART Control SDTF Card slot · Features: Support MP3 and WAV decoding format · Specifications: Support sampling frequency