SummaryBased on the original spool holders from Prusa. Changed it so they clip tight under the top of the frame. Press them down from the top and push the bottom in place. Also added support for a 8mm rod. I used a 110mm long rod and combined it with a spool hub to adapt the 50mm spool inner diameter (plenty of those on Thingiverse). I used a customized version of this one http://www.thingiverse.com/thing:605360 . Also included the clip on system with the original Prusa i3 top spool holders as I found them to also work great. This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/laMFsRZ4VUX This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/lVfuZxUlZLV Will soon make a double middle one so we can mount 2 spools.Print SettingsPrinter: Prusa i3 PlusRafts: NoSupports: NoResolution: 200 umInfill: 22%Notes: ABS