M-LOK Snap-on Cover Plate
thingiverse
This is a very basic M-LOK Cover plate that should fit into the holes.Flat side on preferably textured plate for a nice texture.IMPORTANTYou may need to change the dimensions in your slicer to make it fit as snugly as possible, in my case I had to scale X to 101% and Y to 102%.
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