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Looks like they have come out great, have to let me know how you get onwell I finished printing them, got 8 tennis balls for £10 and it’s all setup. Seems to give a lot of extra cushioning and “movement” in the rear end. Doesn’t feel weird at all, more natural if anything.
650ish grams of filament
16 hours to print
£10 of tennis balls
5 mins to install.
So around £20 all in. Pretty good.