Notes on Connecting to a BMCU BMCU currently only work well with firmware version 1.05.00 and older version. And we are working on the compatibility with version firmware, you can update firmware with BMCU in the future. Hot plugging is strictly prohibited: Always turn off the power when connecting or disconnecting the printer. Important: Before each printing, please make sure that the option of long retraction when cut in filament setting is turned off, otherwise the filament hub or BMCU may be . Warning: Before you turn off the printer, make sure that no filament is loaded into the tool head. Otherwise, when you load or unloadthe filament again when you turn on the printer next time, the error warning "Falled to check the flament iocation" will appear. If you have fallen into this situation, don't panic. You can unplug the PTFE tube of the corresponding channel from the connector of the BMCU, then manually press the cutter leveron the tool head to cut the filament, then press the lever on the left of the tool head to release the filament, then pull the filament back from the BMCU, and finally insert the tube back into the BMCU. (The white and pink color of the discharge port is random and cannot be specified.) Color: White Material: plastic Package Contents: 1 set of BMCU 370C