This is a modified version of  Kmech_toys's  model Mech Modular NG3.

Modifications:

• Refined the original model which has many non manifold edges.
• Enhance the strength of joint dock at the bottom of body part.
• Decrease the size of joint ball with 96.5%. The original joint ball is too tight to break the model.
• Tested on bamboo X1 with bamboo studio use different slice options.