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Hello, I want to propose to you, a solution for self replication using pvc tubes for electrical systems of 12/16/20 mm in diameter, this below for examplehttps://www.amazon.es/Electrical-Conduit-Schedule-Pipe-PCS/dp/B07N8K5KNH?SubscriptionId=AKIAILSHYYTFIVPWUY6Q&tag=duc0d-21&linkCode=xm2&camp=2025&creative=165953&creativeASIN=B07N8K5KNH
... but you can buy it at any electrical equipment store.
Beware of imperial measures as in the USA, and metric standards in almost the rest of the world.
In this way the longer parts are replaced with pvc tubes (which are very cheap), while the whole mechanism is almost the same as now.
anyway ... good job!