Customized version of https://www.thingiverse.com/thing:1926664

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=1926664

Using the following options:

width = 50
height = 84
edge_thickness = 2.5
spring_thickness = 2
triangle_wall_thickness = 1.5
base_thickness = 2
wave_fraction = 0.5
tool_holder_thickness = 2
tool_holder_inner_diameter = 16
tool_holder_height = 15
mini_support_thickness = 0.4
nut_tolerance = 0.3
pen_screw_hole_diameter = 2.9
pen_screw_nut_thickness = 2.8
pen_screw_nut_desired_width = 5.33
base_screw_hole_diameter = 2.9
base_screw_nut_thickness = 2.8
base_screw_nut_desired_width = 5.33