BGELIG0920
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Make sure to switch to the Australia Warehouse. The RRP is $50USD (about $70 AUD), usually coming from a Chinese or American warehouse. The starting price of $56 AUD isn't showing as a "sale", but with the further 10% off and very quick shipping time from Banggood's Australian warehouse, this seems like a good deal
The BL-touch is an autobed leveling sensor for 3D printers such as the Ender 3. It senses the height of your printing bed, and creates a topographical map of the different points, to see where is too low/ too high. Software can then "compensate" to these differences by adjusting the height of the print head, giving a much better first layer without needing to manually adjust every time. This is really useful if you hate re-leveling your print bed, or have height errors caused by a misaligned frame.
Are there cheaper version of this? Yes! But they are often built with lower quality (meaning less accurate readings), lower reliability (meaning they may not work properly/ require constant adjustment) and come from China (so long shipping time). Imo using an unreliable sensor defeats to point of auto bed leveling, so better to buy a good one the first time round.
Edit: Is this real?
You couldn't say for certain before receiving, but all signs point to this being genuine. Banggood is one of the more reliable Chinese electronics retailers (especially given this is a part from their AU warehouse, I doubt they'd go to that much trouble for a fake). They've noted the Brand with a link to the official Banggood Creaility page. There is 311, 4.96 star reviews, which all seem to say it's genuine. Banggood customer service is semi reliable, so in the unlikely event it was fake they'd probably let you return it.
I have the SKR mini v2.0 board coming, do i still need the full kit for BL touch or can i buy just the probe for my ender 3 pro?