Customized version of https://www.thingiverse.com/thing:1626529

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=1626529

Using the following options:

holder_x_size = 13
holder_x_size_space = 10
holder_y_size = 15
holder_y_size_space = 10
holder_height = 30
wall_thickness = 1.85
holder_x_count = 6
holder_y_count = 1
corner_radius = 2.5
taper_ratio = 1
holder_offset = 5
strength_factor = 0.66
closed_bottom = 0.0
holder_cutout_side = 0.7
holder_angle = 0
hole_spacing = 25
hole_size = 6
board_thickness = 3