Customized version of https://www.thingiverse.com/thing:3840723
Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=3840723
Using the following options:
device_count = 1
plate_height = 1
spacer = 0
offset_opening = none
$fn = 24
border = frame
1st_device = keystone2
2nd_device = blankbox
3rd_device = blankbox
4th_device = blankbox
5th_device = blankbox
6th_device = blankbox
stud_scale_factor = 1.02