At the lab, we frequently print "enlarged" contact sheets. We use a Durst Laborator 184 to enlarge an entire roll of 35mm or 120 (6x6) up tp 20x24. With a 300mm lens and a 380 to 380 condenser set convex to convex, set to horizontal. The antinewton glass carrier makes easy work of the job. We can get larger with a adjustment to vertical, but so far , no need.
Bill