In a gearbox, making all the parts to print is not the final check. A simple no load spin test by hand can “feel” a flaw in the bearing set, alignment of the gears, gear teeth backlash, and so on.
Rj Link’s experienced assemblers will hand spin the gearbox to ensure a smooth rotation in both directions. The gearbox is then put thru a high speed spin test to listen to the gearbox. Under no loads you can often hear if there’s an issue. Please contact Rj Link International if you have any questions.