K40 Motorized Bed


**CHANGELOG:**

* 2023-10-13: Improved the “Stepper Support - Support” part to prevent nuts rotation
* 2023-10-14: Reduced the global footprint and fixied various issues with the stepper support
* 2024-01-09: Added some holes in the “Stepper Support - Tensioner” part to make assembly/disassembly easier + a new variant that can hold a long lever end-stop microswitch
* 2024-01-17: Updated “Stepper Support - Tensioner - with microswitch support” part to make the microswitch seat a bit higher
* 2024-02-08: Added the STEP files

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I've been using for some time the really good motorized bed made by Jean-Philippe Civade but thought some things could be improved:

* the use of thin M5 threaded rods made the whole assembly a bit fragile and prone to seizing if they were not perfectly straight (which can end up being hard to source…). Also I found the pitch/lead being a bit low.
* it could be a bit wobbly due to the placement of th