Filament Rewinder
Hi all,
Really like the idea of a filament re-winder, and was wondering if anyone has setup a simple motorised filament re-winder for MMU2S?
So far I have found out that putting a DC motor in one of the original MMU2 holders can be used to turn back the front roller easily.
Was thinking of putting a simple rotary encoder on the mmu2s extruder motor to trigger the motor only when the filament is going backwards.
MeltP
RE: Filament Rewinder
Good point - the re-winder you mentioned that looks great, it's what inspired me to try something new, but I had a few ideas
1) I wanted to reuse the original mmu2 holders without having to replace them or making too many changes (to save a few days of printing)
2) A saw a few comments (not about this particular design) saying that the bowden had to be of certain length or it would pull too hard/soft. Also thought it might help if there wasn't any reverse resistance on the filament while it's pulling it forward. Perhaps a mechanism that only rolls back the filament when it's required and stops when a set torque is reached.
I don't think it would be too hard, a couple of sensors attached to an Arduino shouldn't take more than an hour or two to get going with simple code, just not 100% sure about what method to use. Sensors and board shouldn't be much more than 10-20 euros at most. Kind of curious if anyone tried anything similar already, otherwise I could give it a go and share the design if anyone is interested.
RE: Filament Rewinder
A much simpler solution should be possible (per roll) with: 1 motor, a few elastic bands, a bit of wire and a limit switch.
Motor would rewind the filament until it is taught and triggers the limit switch
RE: Filament Rewinder
Why overcomplicate things?
https://www.thingiverse.com/thing:3691892
I am using a version of that, scaled down to fit inside the Rubbermaid 22 cup container. I have it in my collection of MMU2S mods on Thingiverse.
RE: Filament Rewinder
Or use this one
RE: Filament Rewinder
I've found that the spring loaded ones lose tension in the spring after a while.
I'm looking for a gravity operated version. Something like this:
https://www.thingiverse.com/thing:3745720
But i'm looking for wall/slat-wall mount.
I'd normally create one myself but i'm lacking the time/brain for the task.
RE: Filament Rewinder
Hi,
I had a bunch of motors lying around so I came up with this:
https://drive.google.com/file/d/10b4bHWae1ol-X_JYIpZisy1fO5TSvif3/view?usp=sharing
This is a quick video before it was on the machine, but so far it's working great 🙂
The front part is printed in PLA and contains a small counterweight.
When there is no tension on the filament, the switch is tripped by the counterweight and the motor runs.
Any tension on the filament stops the motor.
Speed of the motor is determined by the number of volts, I use 12v from an adapter I fond lying aroud which can power at least 5 of these.
(Also: If the filament runs out, then the counterweight drops out in the tray and the motor stops)
RE: Filament Rewinder
@melting-point
This looks great. Can you share your model files and part numbers? (Motor, etc.)
RE: Filament Rewinder
Don't know if anybody saw this
RE: Filament Rewinder
id love to see this your link doesn't work any more i want to build something like this i have tried almost every rewinder and buffer out there but something powered i believe would be them all out
RE: Filament Rewinder
IIRC it's on thingiverse. I made one but didn't use it. I found that having the spindle mounted on bearings and using controlled fiction I could achieve the same result.