/3/ - 3DCG

>>955047
I had this same issue and asked the same thing here a good while back.
I had thought you had to use the Modulo funciton in conjunction with the XYZ coordinates, and thought it should work, but it hadn't.
Turns out I just plugged some shit in wrong.

Anyway, you need 2 vector math nodes.
One set to "Add" and the other set to "Modulo".
Take your vector from your mapping node and plug it into the 1st input of the Add, and output the Add into the 1st slot of the Modulo and feed it to whatever you need. The second input of the Modulo node controls what part you use for the repeat, and you can offset things if needed with the second input of the Add.
Also you can adjust how many repeats there are just by messing with the scale of the mapping node.

That's it. Seems like there'd be some complicated solution, but it's pretty simple.