Bibo Bed Clamps

Clamps that help secure the glass bed from later movement. It also helps keep the heat bed and glass together. I removed 1 spring from each side on the front and added a #4S washer to the top of the spring and used the stock washer on the bottom. Probably can just reuse the stock washer on the top of the spring and it will work.

I know the "washer groves" on the inside of blocks don't do anything as they are on the bottom side of the heatbed, but didn't feel like filling them in. Also, there is some room to tweak the depth of the heatbed grooves to remove the yaw, but they seem to be pretty secure so far in my prints and I'll address that it it becomes an issue.

15 Jan 18
Added V2 of the front two clamps with a hole for the allen wrench to be used to help tighten down the clamps and the nut. Mine had loosened up a little and cause a layer shift during the print. Since I was able to snug them down better. Also, corrected the back right clamp as the second extruder would almost b