A1 Mini mod to reduce the likelihood of filament tangle on the reel when the print head moves from the top to the base of the heat bed. It allows the filament to remain stationary on the reel when the print head moves rapidly up and down. I've had it get twisted on the reel spool in some cases but this reduces the likelihood of this happening.

1. Attach it to the bottom nut of the Z-axis Linear Rail and to the right rear of the A1 Mini just under the reel assembly.
2. Insert PTFE 4.0 mm tubing into the open channel which is 4.4 mm in diameter. This allows for smooth movement of filament through the mod while holding the PTFE tubing firmly in place. It should still work OK without using the additional PTFE tubing but I haven't tried it.

A video showing it in operation is at https://youtu.be/Xd_1KKXulAI