Make sure your printer is tuned correctly. This is a common issue with miscalibrated printers. There are hole and peg test prints out there to help you find this problem.
They are designed to not lose your module–since the USB-C port tension isn’t available to hold the module in, I apply a slight ramp of a couple degrees near the back of the port. I was a little concerned that for some 3d printers, it might result in them getting stuck–so that’s why I put the little hole in the back to be able to push it out (if the thumb spot doesn’t give you enough grip).
I’ll take a look at the snack drawers and see if I need to make a tweaked design just for them–or if I can make some slight adjustments to make them work together better.
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Uh oh @XenoCow! 
Maybe the humor is just in my head…The fact that one of the Feet “ate” a SNACK Drawer and would not spit it out is amusing to me. NOM NOM NOM! 
Just the friction alone should be enough to hold it in place, I can not imagine someone is going to tuck one of the feet with a module under their arm a’la American Football style and go charging around. I read that @Jamon_Terrell put a few degrees of slope to tighten it up, maybe a little too much!
Great job testing it out though!
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I’ll try that and report back when I have. It may have just been the PLA I used for the foot. It has been sitting out quite a while and it has been very humid here lately.
Do you have any recommendations for specific ones?
In order to make the best use of the expansion card space, the drawer frames do not have a back face, only sides and bottom. So, that hole could not be used to push the card out as there is nothing to push against.
Also, I hope I am not distracting too much from the purpose of this thread. Although the SNACK drawers are kind of a silly use case for what to put in those storage slots, this investigation might help those that have other custom expansion cards.