You can use separator in the for:
[template public loop(element : Model)]
[for (var : Integer | Sequence{1..3}) separator('\n')]
[var/][/for]
[/template]
or you can trim the result of template "loop":
[template public loop(element : Model) post(trim())]
[for (var : Integer | Sequence{1..3})]
[var/]
[/for]
[/template]