I built my enclosure with V-slot 2020 Aluminum profiles and 3mm Acrylic Panels. Because the slot is 6mm wide, the panels were not very firm within the profiles, so I built these gaps.

They also work in reverse, as a regular slot cover :)

Print settings:

• Material: 98A TPU
• Layer height: 0.3mm
• Line width: 0.7mm
• Vase mode

Increase the length as necessary. I printed them pointing upwards so I could get print them in vase mode. The print gets less stable as it goes upward, so lower speed as needed.