Ultimaker Extruder Drive Upgrade
by Bertho, published
Ball bearing & spring loaded pressure plate for uniform feed regardless of filament thickness
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Included in the zip file are: .par =Solid Edge .stp .igs .stl For detailed instructions see: http://www.vinland.com/UM_Extruder_Bearing.html
The bearing can be found here for $7.41: http://www.mcmaster.com/#standard-ball-and-roller-bearings/=i853dw It is a Dynaroll SMR128ZZ A5
The spring OD is 7.72mm, has 8 turns of 1.14mm wire, and a free length of 20.9mm. Sorry, I do not have any part number since it came from my big junk box...
Since I needed to measure the spring used for the Ultimaker Upgrade I documented the steps both for a high accuracy measurement procedure and a simplified one.
Note, the spring for the upgrade is not critical. There is a tremendous adjustment range.
I added a section on Extruder Drive Force Measurements: http://www.vinland.com/Extruder_Drive_Force.html
The long screw is 50mm. The shaft screw needs to be 20mm since the yoke is 18mm.