More t-slots

As promised here is the second instalment.
I like the 20mm size Im making them all that size. if you need a bigger size let me know and i will try to make it so.and thanks to protoparadigm and dkennell for there printer designs
thats why Im making 20mm t-slots
hoping it will help everybody that use t-slots and mabeyit will inspire more people to use them.