This holder is for the Gridfinity system by Zack Freedman, see also this YouTube video.
It fits four 150 mm long bits with a max diameter of 7.5 mm each. One end features a plate for labeling and is also cut out a bit deeper to allow for easier access to the bits.
Printed in PLA with a 0.6 mm nozzle and 0.4 mm layer height.
The author remixed this model.