Filament dryer

I have Tarrington House FD1250N model but as I know most of them have the same diameter of shelves.

Filament holder and walls are separated things; you can just print one of them.

You'll need 623 bearing (x8) and some M3 screws. 

There is no special manual - just see photos. Generally - mount bearings to bottom parts as on photo, next mount all of them with thread in plastic (!). If you broke it - there is a place to use a nut. Remember to use gaskets between bottom mount and cylinders - just to make it roll freely.

Walls are also simple to connect - there is a large margin so calibration of your ptinter doesn't matter. Put 4 parts in original shelf and then connect them (I have used a soldering iron but glue is also OK). Made it from the inside to have a good looking external walls.

Holes in walls are optional - if your drier is under the printer you can lead filament throught holes in original top.