Ikea Maximera drawer box for use with Gridfinity

Boxes to fit neatly into the funny tapered part at the side of your Maximera drawers, leaving an exact number of Gridfinity grid units in between (5 for the 400mm cabinets).

These are all left side boxes. Mirror in your slicer to get the right side. 

For 600mm width cabinets see larswa's original post.

If you open the f3d file in Fusion 360, you can make other widths that maintain the right angle in the User Parameters page. Move the history slider back 4 steps to remove to top tab.

A remix/extension of larswa's design, with a f3d file modified to be a bit more parametric, and figured out the correct width to fit my 400mm wide Maximera drawers (they are still exactly 10 units deep, but only 5 wide between these boxes).
Also pre-made some STLs in Gridfinity unit lengths of 2,3,4,5 and 6 rather than just 100mm (which doesn't divide nicely into the drawer size) and also with or without tabs.