Replaced a broken arm that my brother gave me. Thanks for a great project!
Prusa i3 MK2(s) & MK3 Spool Holder - Frame Mount - Top Loader
Replacement for the original Prusa MK2 and MK3 top loader spool holders.
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updated October 18, 2019
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Love this design, had another one out of PLA when my printer was orange/blue. Had to redo this one with the same colors of my upgrade!
Used Overture PETG colors.
Great design! Cheers to he author. (edited)
Holder so nice I printed it twice. Did this print in PETG, with the rollers themselves in flexible TPU (to avoid any possible noise from plastic on plastic rubbing). PLA would be plenty strong for this though, it is plenty thick.
The arms grip nicely on the back of the printer, but not so tight so they are hard to get off or hard to nudge around a bit if you have spools of different width you are swapping between.
Everything printed great with excellent tolerances on my MK3+. Printed the arms and spacers at 0.3mm layer height for speed, printed the nuts at 0.15mm so the thread worked well on them (0.3 mm is too course for the threads to work as that causes overly large overhangs). Printed the bolts at variable layer height settings in slic3er, 0.3mm up to where the threads started and then 0.15 for the threads.
The bolts I printed at 100% infill for extra strength, but I doubt that was necessary with petg, but the time an material change was not much, so worth it IMO. Everything else was printed with 3 perimeters as is my standard and 10 percent infill.
EXCELLENT design, the creator clearly put thought into this, and it is made to be printed.
@Alluvian Hi there, and thank you very much for this detailed review! I wish you much fun with the holder and happy printing!
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@MartinMajewski I will try in future : )
@vxk_1470197 I just printed this with TPU wheels due to the comment above and mine makes no noise noticeable over the sound of the printer. The wheels are a very easy TPU print as there are no hard overhangs, plenty of bed surface etc... I would suggest printing all four at once as I find TPU looks much nicer when there is a decent cooling duration between layers.
Very nice solution and easy to print. The threads at 0.1mm are smooth with little slop. The arms torque inward a bit at the rear when supporting a full reel, but with the holes provided in the arms it would be easy to add a stiffener bar to solve that issue.
I got fed up trying to make the end-to-end drybox thing work, haha. Printed with Overture Professional (PLA+). (edited)
@ufanders_80112 The torqueing inward comment is a good one. I did notice that a little myself, and that may be one reason for some noise issues with hard plastic rollers as the rear rollers may slip a bit due to that. With TPU rollers I didn't notice any additional printer noise.
Alles nach Anleitung gedruckt und alles passt perfekt. Das waren meine ersten gedruckten Schrauben, das Testmodell mit 0,1mm war perfekt, die anderen 3 hatten leichte Fransen. Ich denke, dass die Gewinde einzeln gedruckt werden sollten, um lange Unterbrechungen und Bewegungen nach jeder Schicht zu vermeiden (nur als Tipp).
Everything printed according to instructions and everything fits perfectly. These were my first printed screws, the test model with 0.1mm was perfect, the other 3 had slight fringes. I think the threads should be printed individually to avoid long breaks and movement after each layer (just a tip).
Printed with PETG 225°C
One of the first things I printed for my MK3 (the then recent, now older version, as you can see). Works great, easy to adjust, mount and demount.
Thank you, too!
Works great and smoothly on another 6mm flatbar that is above the printer on the wall (less weight on the printer frame itself).
