No squeak - WIFI motorized Camera Slider
thingiverse
If your pulley end is causing the belt to rub and squeak, try this instead. 1 support to hold the arch up where the pulley will go. I replaced the plastic pulley in the kit with a metal toothed one from Ebay just to stop any slip, but it's not required. This part stops the belt from rubbing against the metal bar extrusion - important if you've got a mic recording audio. Your slicer (my Cura) may complain about a possible problem printing, it's all fine.
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