Mk4/4S Spool Roller with 608s
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Smooth Spool Roller with 608 Bearings that fits the Mk3/4/4S Spool Mount Arm. All Printed, drop-in fit.
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Informacje o modelu
- Źródło
- Printables
- Kategoria
- Prusa Parts & Upgrades
- Licencja
- Open Community License v1.1 + GAtt v1 + Micro v1
This Spool Roller fits the standard Mk3/4/4S Holder Mount Arm. It uses printed or metal 608 bearings to provide a much smoother rolling action for better filament feeding and more consistent printing.
Filament spools went from plastic to cardboard, which has a pretty high friction on the stock spool holder. It can result in uneven filament tension, especially when printing Flex/TPU filament.
This design solves that, with all printed parts (no hardware required).
608 Bearings
The Spool Roller should fit any metal 608 bearing; it also works very well with either of my Printed Assembled 608 Bearings to make it all printed parts:
My favorite bearing for this: https://www.printables.com/model/1642789-608-roller-bearing
Details
Fits standard 1 kg filament rolls, up to 70 mm wide.
Similar size as the original spool holder.
Fits any 608 bearing (printed or metal).
Fits the bayonet joint of the Mk3/4/4S Holder Mount Arm.
The design is optimized for good shaft stiffness without metal hardware, with a wide inner section and a center bearing to minimize shaft deflection under the 1 kg spool load.
Printing Instructions
Printed layout files are included as examples.
Material: PLA works well.
Shaft:
Print it laying down with supports; set the overhang threshold angle at 29 degrees.
At least 4 perimeters (w. 0.4 mm nozzle)
Roller:
Print with random seam & scarf joint.
Orient on the thicker flange with the tapered flange up, no supports required.
Clip:
No supports required
Post Processing
Check the fit of the bearings on the shaft, the surface at the supports might be a bit rough. File/sand the bearing seats if necessary.
Check the bayonet fit in the standard mount, file the bayonet flanges/hooks to fit if needed.
Assembly Steps
Slide the Center Bearing (Purple) into the Roller (Blue) on the tapered flange side; it should slide halfway into the Roller.
Push the Shaft (Yellow) in.
Slide the Outer Bearing (Green) into the Roller.
place and slide the Clip (Orange) in place to lock in the Outer Bearing.
All parts Step 1 Step 3 & 4
Cross section view of the full assembly:
