Description/Features: Bmcu370C Hall buffer version, it supports bidirectional buffering, its feeding is softer and less likely to cause damage to the filamenthub. Supports the function of "long retraction when cut in filament". BMcU is an open source project. It can realize the function of ams-lite at low cost. This kit is currently compatible with A1, A1 mini printers and also with the P1 series (experimental). This kit can only work in 4-channel mode, which means it cannot currently support more than 4 channels via expansion. Specification: Compatibility: A1, A1 mini, P1S P1P(Experimental support), X1 Series (Possible but unproven). Attention: Assembling and debugging this kit may require some hands-on skills, such as soldering wires with a solderingiron, etc. Please purchase with caution.The project is currentlyin beta testing, and there may be subsequent updates to the BOM (Bill of Materials), etc. Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Color: White Material: Plastic+Metal Package Contents: 1 x BMCU370C Auto Refill Farm 1 x Cable 1 x Tube