Filament spool holder

##### Background
In an attempt to separate the filament spool from my bedslinger I searched online for practical filament holders with little success, so here's one I designed to be simple to print and use.

There are 2 versions for the holder depending on what is the size of your build plate: `24cm` long and a `20cm` long one. The bigger one is a bit more stable.
##### Required hardware
This spool holder requires a `18mm` exterior diameter pipe - copper pipes with this diameter are standard in heating/water installation where I live, commonly sold at pretty much any hardware store. The pipe length is `~13.5cm` (that length is rendered in the image).
You'll also need some hot glue or whatever floats your boat.
You may want to add some double sided tape to the base of the spool holder if your 3D printer yanks the filament like crazy.

##### Notes
If you wish it to be adapted to different diameter pipes leave a message and I'll upload other versions as well.
The render and fit testing ha