Snapmaker V1 Project Hold Downs

I found that when I was trying to engrave a 3mm thick piece of acrylic the individual adjustable hold downs in the corners caused the work piece to bow up in the center. This resulted in the job cutting only the center portion of the work piece. These things fasten to any of the securing holes in the SM1 base without having to fiddle around with the screws and the individual corner hold downs. There's also a hole in the center that you can insert a 3mm screw to add a little more down force in the center of the work piece.