AC Stack-On 17 Storage Box Removeable Divider

For years I have used the Stack-On 17 compartment storage organizer box for my small parts, at this point I have nearly 2 dozen of these storage boxes, however it has always annoyed me that the box is capable of 20 individual compartments, but they only provide you with enough removable dividers to block out 17 compartments. In the past I have made temp dividers out of anything from cardboard to aluminum, but finally now the simplest solution, just print more! =)