Updated k8200 glass panel clip

This is an updated Velleman k8200 clip to hold their glass panel on the heated bed. The clips that Velleman provide stls for are square in shape and the tolerances are off so they don't provide any pressure on the glass to hold it down. These are the same basic size (a little longer on top) and I've included the source file if you want to modify them to be shorter.

These clips provide enough tension to hold the glass in place while printing. I printed these with 100% infill and they've been h