A workhorse MK4 1kg Spool Holder
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An original frame mounted 1kg spool holder for MK4 Prusa printer. « Combat Proven » with more than 1500 h servicing.
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- Printables
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- Prusa Parts & Upgrades
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- Creative Commons — Attribution — Noncommercial — Share Alike
So happy with my Prusa MK4 printer, results and ease of use are well above my wildest dreams !.
However, I soon realized that the stock 1 kg double arms spool holder was behaving under my expectations. Therefore, after not finding a free satisfying alternative, I decided to design from scratch a solution using Blender modeling tool. I waited until I was sure of the result robustness and efficiency, which I guess are reached after more than 1500 hours without issues and regrets. And now I am happy to share.
Main features :
- Ball bearings spool roll mount, so that filament traction effort is minimal for Nextruder gears
- Very gentle to the MK4 printer frame, with a screw & nut claw system (no worrying force clipping…). Tightly secured to the frame, easy to mount/dismount. Designed and tested « colision free » between fork/claw and extruding head.
- A filament guide working in any extrusion head position even the uppermost left and right Z, always with reasonable filament bending
- Easy spool change, simply raise and lower the spool roll
- Although designed for Prusament 1kg spools, versatile spool types accepted. Optional flanks provided to better fit cardboard spools or loose spool holes (eSUN, SUNLU, Overture, …)
Additional Parts:
A few non-printable parts are needed :
- 2x 608ZZ ball bearings. Size : d1 8mm ; d2 22mm ; w. 7mm (skateboard type, very affordable)
- 4x M4 inserts
- 6x M4x16mm PCS screws
Printings Tips :
- gcodes are provided only as an indication for orientation and look. My advice is to reslice the STL files to fully master your own parameters and generate new bgcodes with up to date Prusaslicer version and drivers
- Most parts : Prusament PETG, mixing Orange and Galaxy Black to fit nicely with your MK4 printer
- Layer settings : 0,15mm STRUCTURAL
- Optional flanks : PLA
| Part | Perimeters | Infill | Supports | Rim |
| Fork | 5 | 15 % gyroïd | Yes, painted, organic | 15mm, 0mm spacing |
| Claw | 6 | 30 % gyroïd | Yes, adjusted | None |
| Guide | 5 | 15 % gyroïd | Yes, adjusted | None |
| Roll | 4 | 15 % gyroïd | Yes, adjusted | 25mm, 0mm spacing |
| Spacers | 5 | 30 % gyroïd | None | Optional |
| Flanks | 3 | 15 % gyroïd | None | None |
Mounting tips:
- After mounting the ball bearings on the roll, very gently tight spacers as the M4 threads are quite fragile. Test roll fitting with the fork
- Press the four M4 inserts in the fork with a soldering iron, make sure to press them a little below the free surface, remove possible melted excess
- Mount the filament guide
- Center the spool holder on the frame before tighting the claw screws
Usage tips:
- Always use the filament guide
- Use optional flanks for cardboard, thin width or large hole spools