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twas the secret to PR's DIY limited success..... simplify and cheap'en (shame they concentrated on the "cheap'en" part more though), once you start to get more complicated rigs like Tronxy's X5 range there's more to go wrong.
with a coreXY or Delta when you start getting any kind issues you can quickly realise the cause maybe several factors..... with a Cartesian..... the belt needs adjusting LOL