RS (Round Series) uses M10 threaded rods to hold the Y ends in place. The vertical part of the frame is made from 2020 T-slotted extrusions. (That's the one in the photo with the orange frame parts)
TS (T-Slot Series) uses only 2020 T-slotted aluminum extrusions for everything. (That's the one in the photo with the blue frame parts)
Both versions are maintained in the same repository and have mostly the same parts, except for the y axis ends and brackets.
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