By request I have designed this ACME-style conformal rail guide for mid-power rockets and high power rockets. It is conformal to 98mm airframe rocketry tubing and will fit the 1515 size of 8020 aluminum extrusion rail.
There are two basic versions (rounded and chamfered) with three different lengths that are designed to be glued on.
Short length is 38mm (1.5 inches) long.
Medium length is 50mm (2 inches) long.
Long length is 75mm (3 inches) long.
Recommended infill: 100%
E-F motors: PLA
G-H motors: PETG
I-J motors: ABS