Smaller print bed version

I redesigned this for a smaller print bed - this fits on a 220mm bed and comes in six pieces (actually, you only need the one of the front and back corner pieces and one of the front and back centre pieces - the corners can be rotated and mirrored in the slicer to print all four corners of each half, and the centres can be mirrored or rotated). The 3mf file however contains all 6 pieces. The holding pegs in the original files were slightly too big so rather than modify the frames, I simply created a new version of the peg that fits this design. The original handles should fit if you want them. The overall length is slightly bigger than the original at around 600mm, but is approximately similar in width. You could however miss out the middle piece to make it about 400mm in length.