Gridfinity R8 Mill Holder Tray for 3/4 shank

See link for original (non Gridfinity) version:

https://www.printables.com/model/535163-r8-mill-holder-tray-for-34-shank

I had been intending to make this model for a long time, and I finally got around to it.  This is a remix of my mill holder tray for 3/4" shank tooling, to bring it into Gridfinity.  The recess is exactly the same size as my previous model, except longer at the tool end, where I extended it slightly to fit 2x4 squares.  This means that while it fits my mill holder, I can't guarantee that it will fit yours.  One of the reasons I took so long in adding Gridfinity to this, is the mill holder is too wide to fit in a 1 square width, but going up to 2 squares wastes a bunch of space.  There's not really any getting around that unless I made it to overhang slightly on one side, and put it at the side of a drawer with a little extra space.  I didn't like that either, so here it is in 2x4 squares.  It's going to overhang a little at the tool end; there's nothing to be done about that, and it's not enough of a nuisance to be worth expending the material to go to 2x5 squares.

I eliminated the "hood" from the drawbar end of the recess, which was an artifact of my original tray for R8 mill holders, and isn't really useful in this model (it was an anti-tip feature for the mill holder).  It also had to go because that model printed standing on end, which wouldn't work with Gridfinity.  Additionally, I changed the retention magnets from a single 8mm round magnet, to a pair of 6x3mm round magnets the same as are used in the base.  These are optional, but I think they are beneficial depending on how you orient the tray in a toolbox drawer.

Like my other Gridfinity models, the base is altered to accept 6x3 magnets as a press fit, with the upper surface of the magnet holes modified to make the slicer bridge across correctly for a clean result.  Due to the size of this model, I have included sacrificial “mouse ears” in the CAD to give the ends more surface area to help prevent them warping off the bed.  These will need to be removed after printing.

The unit pictured was printed out of Polymaker ABS on my Voron 2.4, using a 0.6mm nozzle, at 0.3mm layer height.