Recently got my daughter a pair of Crocs and she found a set of charms on Amazon (generic Jibbitz).  Great value with about 100 charms for $10, but on her first day wearing them one or two fell off her Crocs, resulting in an immediate crisis as we searched a friend's yard to find them.  After coming home I quickly designed a washer-like ring and 3D printed it.  I can snap these over the back of the charms and it prevents the charm from accidentally popping out of the holes in the Crocs.

These are very thin (1mm) to minimize any chance that they are felt in the shoe.  I've also added a small hole so you can hook it with a bent paper clip or similar tool when you need to remove these.  Small Crocs + big hands makes it hard to reach inside and grab these to remove -- I think the hole and hook technique might be the solution.

Generic Crocs Charm/Jibbitz Backer / Washer

Crocs Charm Washer.stl

2x3 solid Gridfinity bin designed to hold 10mL essential oil bottles.  This model will hold 11 bottles total, but the cutouts for 8 of those 11 bottles are stepped to hold either the short and fat bottles or the taller, skinnier bottles that are sold as roll-on oils.  This design allowed me to minimize the need to print additional bins  as my wife's collection changes.  

Would love feedback or remixes on this.  This bin took a little under 6 hours to print on my Ender 3 Pro with a 0.4mm nozzle @ 10% infill, but that was after I upped speeds and reduced walls two 2 perimeters.  I'm still learning how to best calibrate and maximize speed and quality on my printer, so no doubt the more skilled folks out there can do better. 

Gridfinity - Essential Oil Bin

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Generic Crocs Charm/Jibbitz Backer / Washer

Gridfinity - Essential Oil Bin