20mm T-Slot Rail Cover (6mm channel)
thingiverse
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/dtUdw5KjyO1 This is 100% my own design for what ever that is worth. Import this into Tinkercad and change the length to suit your preference. 150mm seemed like a good length and works just fine for me. Since there is no infill it can be cut with a razor just fine. This is a really snug fit compared to the purchased rail covers. I use this to hide unsightly wires but can be used for other purposes.
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