The Marui 4WD chassis used for Ninja, Thunderbird Coors and Shogun requires S30 parts to replace trust washers while using ball bearings. The part is on the servo saver cluster, and among the chassis I got, none came with the unused parts and one came with the ball bearings allowing me to measure the part.

The print itself is a very short print, and should take less time to print than to heat the printer.