g90
#<radius>   = 1.5
#<cornerx>  = [-[10.25+#<radius>]]
#<cornery>  = [4.9+#<radius>]

#<cornerbx>  = 0
#<cornerby>  = [8+#<radius>]

#<diffx> = [#<cornerbx>-#<cornerx>]
#<diffy> = [#<cornerby>-#<cornery>]

#<MAX_stepover> = 1
#<MAX_stepdown> = 0.2
#<depth>        = 8

#<downfeednr> = [FUP[#<depth>/#<MAX_stepdown>]]
#<stepdown>   = [#<depth>/#<downfeednr>] 

#<repeatnr> = [FUP[#<diffx>/#<MAX_stepover>]]
#<xstep>    = [#<diffx>/#<repeatnr>]
#<ystep>    = [#<diffy>/#<repeatnr>]

#<offsetz>  = 0

G0z[#<depth>+1]
G0x#<cornerbx>y#<cornerby>

o<downfeed> repeat [#<downfeednr>]
    #<offsetz> = [#<offsetz>-
#<stepdown>]
    G0z#<offsetz>

    #<offsetx> = #<cornerbx>
    #<offsety> = #<cornerby>
    o<relief> repeat [#<repeatnr>]
        #<offsetx> = [#<offsetx> - #<xstep>]
        #<offsety> = [#<offsety> - #<ystep>]
        G0x#<offsetx>
        G1y#<offsety>
        G1x#<cornerbx>
        G0y#<cornerby>
    o<relief> endrepeat

o<downfeed> endrepeat


M2