Belted extruder

Simple belted extruder, which is originaly made for Geetech i3 and was inspired by [Itty Bitty Belted Extruder](https://www.thingiverse.com/thing:389105) and [Belted Extruder v.3 for 1.75](https://www.thingiverse.com/thing:1764551).

Important notice !
The hobbed bolt used in this extruder is shorter than the common M8 hobbed bolt. To keep the size of the extruder as small as possible I used a regular M8 hobbed bolt, filed its head and threaded it as seen in the picture. This method work, but the generic hobbed bolt has a smaller diameter than 8 mm which creates a small gap ( this can be solved with a layer of sellotape).
You could use a standard hobbed bolt, but you would need a standoff.

Bom
* 4x M3x5mm - for stepper
* 2x M3x30mm - for tensioner
* 1x M3x20mm - for guidler
* 2x springs
* 3x M3 nuts
* 8x M3 washers
* 1x Push-fitting with 9mm diameter
* 1x 16-GT2 pulley
* 1x GT2 Timing belt 180mm/90 teeth (can wary slightly)
* 3x 608 bearings
* 1x Nema 17 stepper m