Lately I've been printing 3kg spools and I've made some jumbo spool holders for each of my printers... here's the Prusa i3 version that works on all i3's from my Mk3 down to the Mk1. You can use a 3/4in or 20mm diameter PVC pipe for the spindle or else print the spindle in the thing files.
This is nice and solid and holds up to a 5kg spool.
I’ve got something for all the Prusa i3 owners out there, it’s a new improved spool holder to replace the one that came with your Prusa versions Mk1 to Mk2S. I’ve done away with having to detach the arms each time you change a spool and I made the arms attach much more securely. In this design I’ve incorporated a removable spool spindle out of the cheap and common old PVC tube or you can simply print up the included spool model.
The spool holder can be found here:- http://www.thingiverse.com/thing:2395279
I've also added a video to showcase it here:-
I've made a Spool holder combined with an LED light for my i3 MK2 and I'm really happy with it. I’ve done away with having to detach the arms each time you change a spool and I’ve incorporated a removable spool spindle that easily locks in with a satisfying snap!
You can find it here: - http://www.thingiverse.com/thing:2405360
I also made a video to showcase it plus show how it's put together here:-
It’s simple to put together so if you can solder a wire and use a hacksaw then you’ll find this a piece of cake… even better, the parts cost under $10 which is awesome given the results. I’ve included links to the parts in the description.