Exactly - you can't use 3D printers for engineering applications, but some people think they are wonderful OK for trains set scenery items though evidently, saw it on the telle
I put some throttle spacers on my 1199s after getting a bit peed off with the slack in the throttle,I've come from jap bikes and yes you should always have some slack in the throttle but not as much as my Pannigale had it makes it so difficult to ride smoothly through traffic The transformation wasn't quite night and day as the advert said but I would recommend fitting them Again if you don't like it just remove it is only a 5 minute job