How have the bolts held up? It looks like you've default oriented them vertically. I've found that makes the stress along the layer lines and I've had to reprint horizontally (which means support but that's how it is)
Not my design, nor have I printed it,
But looking at it, those printed bolts should not be under a lot of stress. They appear to just hold the part from sliding off the table.
All the weight of the drawer and it's contents should be in the C-Clamp shape.
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