為了印 80%鍵盤的外殼，不要拆分列印，把 300x300 的列印範圍改成 400x250。改這個尺寸是因為淘寶只找得到這個尺寸。
控制程式改用 Klipper，為此多買了 MKS pi 當控制器，也多買了一個 MKS Gen-L 2.0，再把步進馬達控制器改成 TMC 2109，可以使用 UART 控制。
雙Z軸，可以使用 Bed Screws Helper、Bed Screws Tilt adjust Helper、Z Tilt 來協助調整列印平台的螺絲以及兩邊Z軸的高度。參考 Klipper -- Configuration reference 及 Klipper -- G-Code commands。
參考 TMC drivers，For best positional accuracy consider using spreadCycle mode and disable interpolation (set interpolate: False in the TMC driver config). When configured this way, one may increase the microstep setting to reduce audible noise during stepper movement. Typically, a microstep setting of 64 or 128 will have similar audible noise as interpolation, and do so without introducing a systemic positional error.
stealthChop 力矩較小較不精確，但較安靜。It is recommended to always use "spreadCycle" mode (by not specifying stealthchop_threshold) or to always use "stealthChop" mode (by setting stealthchop_threshold to 999999). Unfortunately, the drivers often produce poor and confusing results if the mode changes while the motor is at a non-zero velocity.
購買清單及報價 (RMB) 如下
- Z軸的鋁板 x2 和轴承 x4，共58元
- X軸線軌，558mm*1，滑塊 *1，共72元
- 2020 鋁材，長 575mm*5，共50元
- 1020 鋁材，長 575mm*4，共30元
- 皮帶 10米，3元/米
- 运费，15元
