40mm carriage

Hi,

I already have a alu effector from one of the countless ali express vendors which worked well, so I thought of upgrading my carriages to. However I cannot seem to find a carriage that has a roller distance of more than 20mm like this one

My frame consists of normal 20x20 alu extrusion so I'd expect to find at least some 30mm hole distance for the rollers for the smaller rollers.

Anyway, has anyone ever bought 40mm carriages from somewhere?

Cheers

You usually mount those carriages (using those 20 mm spaced holes) onto a back piece which holds the rollers. That said, I would recommend linear rails over rollers any day!

ahh right, that makes sense. thx