spool holder for Bambu lab A1

1.I realized that the spool holder can be mirrored to accommodate 2 spools.2.If I fasten the 2 spool holders as far as possible they can hold 4 spools.3.To be able to insert a spool into any of the middle slots without removing the entire spool holder, I shorten the horizontal bar. It still holds the spools perfectly, but is now much easier to remove and insert.4.You can buy the filament holder and PTFE tubing connectors (links below), but you can't buy the optional horizontal bar, so I had to remake it.5.I recommend adding a Z-axis stiffener to the printer to keep it stable and not tilt backwards.