keeping the weight low down is one advantage of the layout my 2wd project uses, the slipper and spur gear are very close to the chassis plate, the only things really that are of any weight high up are the shocks. weight can be a problem with a carbon chassis, my latest chassis is really like a feather, whole car is under 1300g so it needs a good bit of weight added. i'm sure i read somewhere of a method of strengthening 3d printed parts by bathing in something like acetone breifly, to effectively increase the bond between layers by chemically melting them together, not sure what the print material was though
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