I have reasonable exp. with printing .. have 2 printers and printed nearly 1000 hours of ~100 different designs.
I have 2 issues with your design.. The gear you designed is thinner than the older design -- much thinner, maybe someone before you did this change. As this site has lost credibility .. good designers have removed their design ..Simon/Prusa others.
I have used Simon design with 3mm bolts.. not a problem!