I have Fysetc stepstick protector modules on my TMC2208's, so I needed extra space. I recessed the fan mount and extended the walls of the enclosure. Hopefully this will provide adequate space, I afforded around 14mm of extra space, and the stepstick protectors are about 10mm. I also have 6mm magnets, and my heatset inserts are smaller than the originals.
Also, I'm still pretty new when it comes to CAD. My remix may be... lacking. :)
Update (5/29/2019): I've had everything installed and working fine. I designed a small bracket/clip thing to keep the door shut, as the magnets don't always want to hold (well they usually hold in 2 of 3 spots, or disengage randomly). I will add the bracket on here soon. It is not intrusive and has yet to fall off.
Update 5/16/2019: The hour of installation is rapidly approaching. I have changed the parameters of the standoffs to fit the heatset inserts I have. They are smaller than the original creator's. The inserts I have are M5, OD 6.3mm and length of 5mm. I want to thank TrevJones for including the original CAD files for modification. My feeble skills have allowed me to suit my purposes and use such a great design.
Update 5/5/2019: I have added versions of the top and bottom to insert 6x1.8mm magnets instead of the default. I have a bunch of these on hand. Each magnet insert is likely to be different from each other because I suck and redid each of them manually. But the important dimensions are the same. I also removed the included support for the bottom.
EDIT 5/5/2019: Added v2. I widened the slanted sides to more closely match the original geometry. It should fit fine, with maybe a tiiiiiny bit of gap. Also, the original mesh I exported did not include the magnet mounts, so that has been fixed. I haven't printed and test fitted this version yet, but it should be good.
EDIT: It doesn't fit quite right. The slanted sides are a bit too tight together to fit onto the bottom part. I'll have to fix that soon...
Fusion 360, Solidworks
The original creator was kind enough to provide the Fusion 360 files. Thank you!!!
For the standoffs, I downloaded the original file as .STP and used Solidworks to change the dimensions.The author marked this model as their own original creation. Imported from Thingiverse.