This is a remix of the Filament stand made by John Martin

If you want to edit in onshape can do that here: Filament Storage

The Step files are uploaded.

This is a free-standing filament rack that will hold 1kg (~200mm) spools.

With longer dowels i advise using a middle support. My setup is 600m long dowels at the moment.

I have design a connector/bracket to stack these even higher. The Connector are fastend to the main stands with 4x m4x10 screws and 4x m4 bolts. To do this I have made the one end of the stand a bit thicker so there is a place to set the screws. The bolts are just slottet into the connector and should be a pressfit.

The 18mm holes is a perfect fit for the 18mm dowel i purchased at my local hardware store (These are a bitt less then 18 mm).

There are set screw holes that can secure the dowels with M3x20 screws.

This will fit on a Bambu Lab build surface, as shown in the pictures.