Bot120 slow veer to left.

BOT120 has developed a slight veer to one side, left.
Oiled motor gears. Checked motor contacts. Tyres are evenly fitted.
BOT has not travelled many miles. Is this something I can adjust?

First post on this forum, so set me straight if I have veered as well.

Thanks, Ian

Welcome to the forum.

Two DC motors will never be 100% true, but it should still run relatively straight.

The other thing to try is the alignment of the motor in the housing, try rocking it forwards (or back). This affects the friction between the worm gear and the gear, if the motor (worm gear) is pushing harder against the main gear this increases friction.