Ultimaker Extruder Drive Upgrade

thingiverse

A ball bearing and spring-loaded pressure plate ensure uniform feed irrespective of filament thickness. The downloadable zip file contains .par, .stp, .igs, and .stl files for detailed assembly instructions. For more information on sourcing the Dynaroll SMR128ZZ A5 bearing at $7.41, visit http://www.mcmaster.com/#standard-ball-and-roller-bearings/=i853dw. The spring has an outer diameter of 7.72mm with eight turns of 1.14mm wire and a free length of 20.9mm, although no specific part number is available as it was sourced from the junk box. To measure the spring accurately, follow the high or simplified measurement procedures outlined in http://www.vinland.com/Spring-Testing.html. Note that the spring for the upgrade is not critical, with a vast adjustment range. Additionally, measurements on extruder drive force can be found at http://www.vinland.com/Extruder_Drive_Force.html. The long screw is 50mm, while the shaft screw should be 20mm to fit the 18mm yoke.