Came across Nubie5k's compact solution for holding tablets and phones on airplanes. I typically require 2 pairs during travel - to accomodate 2 tablets and decide to remix the box to easily transport 4 x airplane tablet holders. Printed at standard 0.20mm layer height on my Bambu Lab A1M using generic PLA+. Clearence is tight (to minimise rattle/noise) and just nice for the settings, do accommodate the model accordingly if the settings are altered.

Plate 1: Device Holder x 4

Plate 2: Device Holder x 2

Plate 3: Device Holder Box for 4pcs