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This design is based on one I found a while ago and modified extensively. it can be used as direct drive or Bowden and has proven easy to replicate and extremely reliable.3D printer parts and enhancements
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I started with a QUBD extruder and printed a few different upgrades for it. The extruder this is based on was reliable and I used it till about a year ago as a direct drive. On my newer printers I changed the design so that instead of a heatsink and fan mounted to a small cooling block on the motor, I made a large heatsink with fan that the barrel screwed into and the motor and mounted on top. I later changed this to a bowden design and this design can still be mounted as both a direct drive and a bowden. The arm has however changed significantly from the original. the biggest change is the bearing mount now requires a 8mm shaft for the bearing about 15mm long. The spring I use is a much larger diameter one and I source it from RC model cars suspension shock absorbers smaller springs can still be used but you may need to add a cutout to the arm for it. the frame mount is to mount it on a 25mm frame ( I use 25mm square tube aluminum frames on my machines) you may need to design your own to suit your requirements. If you do please feel free to send then and I will include it in the files.
Pictures attached are;
The evolution of the design over time
The assembled extruder close up and entire setup.
The bearing grove for reference
Materials and methods
1x 608 bearing
1x 8mm shaft 15mm long
4x 30mm M3 screws
2X 40mm M3 screws
2x M3 nuts
4mm OD PFTE tube 40mm for arm liner.
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