Ok, technically this is a tray-table-phone holder. But it’s most useful on budget airline flights so you can enjoy your netflix-movies from taxiing to touchdown since your tray-table stays folded up. I’ve started with a fixed design for my Phone size and iterated to an extendable, foldable phone holder. I’ve used different revisions on flights from Eurowings, WizzAir, Ryanair (the magazine-pocket in the table-less seats works as well) as well as trains.
All printed on a Monoprice Mini Delta (my first 3D-printer) with different settings and different PLA-Filaments. Print-time for the last model is ~2h20min but includes a raft and massive support on edges and holes.
an M3 10/12mm screw and self-securing nut is required besides a rubber band.