A spool holder that can accept up to 100mm (4 inch) wide spools and has a rib to keep the spool closer to the filament sensor. Designed to be fitted with NO MODS to the printers parts (see note below) and only the allen key to move the brackets around is needed. Fusion 360 file also supplied should you want to remix it.

NOTE: Older models came with bearings with shoulders/flange on the inside and outside of all four guides, where new printers come with a normal bearing on the inside and a flanged bearing on the outside of all four guides. For newer printers it is easy to install just slide the rollers over the existing bearings and they should fit tight due to a taper in the holes. For older versions you will need to remove one of the bearings so the end the roller fits over does not have a flange on its edge, alternately you could order in 4 bearings without the flange and make it the same as newer versions.

I recommend you stop the print after a small amount is printed to check the fit on your bearings. If it snugs up tight and goes all the way on, then print two of these for your printer, otherwise print it at 101% scale and try again. It is important to setup your printer first by following a guide on how to calibrate your stepper motors so the sizes your printer produces are accurate. Filament diameter and flow settings will also effect the end result and how easy they fit onto the bearings, so please setup your printer first which you need to do anyway before printing these rollers.

Some tips:

1. Cover up your bed so if you drop a tool it does not fall and chip or smash the glass.
2. Use Kerosene, petrol or WD40 to remove the grease out of the inside of the bearings so they spin smoother and turn easier. Soaking for 10-15 minutes in a jar works best as the dust covers on the bearings make getting liquids in there much harder.
3. Take some time to align the two rollers before doing up the 4 bolts that holds it to the printers frame, getting them misaligned means they don't spin as nice.
4. Some stiff wire running from one side to the other can support the filament sensor and allow it to move from side to side if you use very wide rolls. The standard sensor mount works just fine and can be left as is for normal rolls. There are a number of other ways it can be done by printing your own bracket that the standard hardware bolts onto.