MK3/MK4 Spool Holder Sleeve Bearing
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An elegantly simple and universal solution to the excessive resistance cardboard spools inflict on your extruder motor.
- Ocena
- 4,889 / 5
- Polubienia
- 34
- Pobrania
- 171
- Wydruki
- 6
- Wyświetlenia
- 898
- Oceny
- 9
Aktualizacja u źródła:
Informacje o modelu
- Źródło
- Printables
- Kategoria
- Prusa Parts & Upgrades
- Licencja
- Creative Commons — Attribution — Noncommercial
A solution that is elegant in its simplicity, this design aims to remedy issues caused by high-friction interactions of cardboard spools and the Prusa MK3/MK4 spool holder.
The design is simple, easy to print, and minimizes contact between the sleeve and the spool holder without adding too much bulk.
PETG is the recommended material to print this part out of.
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Story:
I love the idea of cardboard spools, but I hate using them. This environmentally-friendly solution to reducing 3D printing waste just doesn't play well with Prusa's spool holder design. My main issues of homing the Z-axis, worrying about stepper workload, and stripping filament all stem from the increased friction the cardboard spools have when in contact with Prusa's spool holder.
I messed around with printing others' inserts for my different spool brands and they worked nicely for a while, but PLA stress creep would set in and cause them to fall out of spools or not fit in to new spools. Additionally, the required print orientation made the hooking parts of the insert weak and the tabs would snap off when trying to change the insert between spools.
Trying to find designs that worked with all the different brands of filament I have left me mildly annoyed that manufacturers couldn't use a standardized set of spool dimensions. That logic was flawed though; it wasn't smart to attack the individual spools as the problem to fix.
Instead of trying to fix every spool and making inserts for every brand and individual spool I own while wishing for a universal solution, why not make a universal solution? Inspired by the comparatively lower friction of plastic-on-plastic, I designed a simple sleeve bearing that doesn't add too much bulk to the existing spool holder design. That way, if the cardboard spool wants to grab on to the plastic it is resting on and not rotate freely, the plastic sleeve will freely spin on the spool holder.
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Installation:
- Twist and remove the spool holder from the attachment point of the design.
- Insert the spool holder into the printed part. (The flanged end should be on the same side as the large flanged end of the print.)
- Reinstall the spool holder on its attachment point. (Make sure you correctly and fully reattach the spool holder to the attachment point. If you have your longest allen wrench that came with your printer, insert that into the small triangular hole in the end of the spool holder and use that to rotate and secure it to the attachment point.)