The stand on the C-Tug Kayak cart is probably the only part that ever breaks. The part cannot be purchased alone and isn't really expensive, but it annoys me that the shipping makes up about half the cost. Additionally, they always seem to break when you're away on holiday, never when you use the kayak from home.
This part is a pretty snug fit, more so than the original, but is not overly tight. I printed the first one with supports as one piece, but a better option might be to print it in 2 parts using ABS and acetone glue the halves together afterward.