A WORK IN PROGRESS!!!!
Fixes that are defiantly needed hole size on the bottom when scaled up, slot width when scaled.

This is a two part CUSTOMIZER THING. This part is the bottom, TOP is found here: http://www.thingiverse.com/thing:1675158

You will need to scale and print both parts.
I have added the STL here for the top in it basic size for reference or for those who just want to download the .stl's and scale them in their slicer.

ONE OTHER NOTE THIS MAKE A GOOD caterpillar chaff for hole edge protection