One way spring A.R.S.H. (Auto-Rewind Spool Holder)
Made this remix due to the original springs, did not last long, as well as it caused problems that the spring could…
54
335
2
3673
updated
June 10, 2020
Makes
Comments
Hi, seems I am like all the other ... I just am starting to improve your A.R.S.H. - if I may say it that way ;-).
NO, seriously. thanks very much for the f3d file.
What I am going to do is .. reduce the REVS to 16. Vincent only made 13. AND i am going to make it thicker / stiffer - Vince and you both use 1mm.
REASON:
If have extended my Lack enclosure by 15 cm AND did put the MMU on top ( Kalle Knall .. thank you ) ... when the spool is at its end,
a.) the spring does not reverse far enough (<==> # of REVS ) and
b.) not quick enough when MMU quickly retracts the long piece of Filament.
AND I will design this to fit in DrTomFlints housing, where via kind of CLICK mechanism, you can replace ths springs within the house. Will let you all see the new design AND will report, which combination of thickness ( stiffness) and REVS does solve this at best. .... BTW ... with a fairly full spool, Vincents modular and stiff one does a good reverse job.
[UPDATE]:
Thank you @peter larsen for the F3D file.
I did create my own with 16 REVs and 1.25 thickness.
I used the technique to click the spring ( replaceable ) into a reuseable springhouse ( DrTomFlint https://www.printables.com/de/model/36011-rewinder-spring-redux )
It works acceptable but what I expected is slightly different.
Obvious the PLUS REVs do not solve my itention. I have to retract 72cm of Filament but when this is done, filement hangs lossely but the spring is not unwound ... there has to be a balance between spring diameter BEFORE goung into the house ( bend ratio ), material thickness ( here 1.25mm with low extra effect ) and the number of revolutions.
the interaction between spring strength and cludge is good - cludge jumps -if i saw that right - 1/2 turn or 1/4 turn each time and the stops. (edited)
@JPG_master this is in the pictures what I was talking about in my previous comment - @peter larsen: thank you again for publishing the design, because this educated me how to design my own springs! The springs are made for Tom Flynn's house and are replaceable. They do come along with a very strong initial tension, because they are 150% diameter of the size of the Springhouse, so when they are in the spring house, they already have a strong pretension and they do a good job with 1.2 mm thickness of the spring material to rewind the 70 cm filament between MMU2S and extruder. I will summarise this in a non-print publication
I like this spring more then the stock one, but I have the same problem with all the springs I print. The springs won't slip in the clutch when set to zero without sanding and working them in.. But a great spring!
do you think this performs better than the 2 part SpringFlat_Modular_v3.4 that was released
(deleted)