Friday, 4 August 2017

Filament spool spindle

If you refer back to some of my earlier posts about the Ultimaker and feeding filament, you will know that I think the friction from the spool often causes under-extrusion. I have a further idea to reduce the drag.

Upside down, for printing

This is a spindle for the spool with bearings in. There are loads of designs available that do the same thing. Most involve clamping the spool in some way to a spindle containing bearings.




I like to be able to easily lift the spool on and off. I see no advantage in a complex clamp. At the moment the spools just loosely hook on a fixed shaft. A bit looser than the original clip in spindle which is very fiddly to work with. This design is just an evolution of the hook but with bearings to make the spindle run freely.


This has worked very well the spool spins freely.

Bill of materials:
1x M8x110mm bolt
1x M8 nylon locknut
2x M8 Form A (normal) washers
1x M8x25mm or penny washer
3x 8mm axle 22mm x7mm bearings (from skates)
Optional:
2x 10mm O/D x1mm thick lengths of aluminium tube cut to fit as spacers between the bearings
The 3D printed parts:
1x Hook support
1x Spacer
2x Spindle halves

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