Summary

I designed this part to fill in the space around the tubes used to fix the motor mount on the Marui Hunter/Galaxy chassis, as those tube tend to break. It may used as well for broken tubes, as you put the part in, fill the broken tube with resine and drill it after to get it back to work.

On the picture, this is a broken chassis, and the part is a samplein PLA I printed to check the dimensions.

For real use, I would print this in PETG, with an infill at 40%: it doesn't really matter for this case of use. Make sure you clean the chassis inside before putting the part, as dust may be give some dimension problems…