UM2E+ Dry-Filament-Dispenser

Moisture reducing filament-dispenser with silica-granulesreservoir for Ultimaker 2 Extended+

3D printer parts and enhancements

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    Description

    The effect of humidity on filament for 3D printers can cause some serious printing problems…
    All filament-types are, more or less, hygroscopic, meaning they absorb moisture from the air.
    This has consequences, often destructively bad, for the quality of the prints…

    In storing filament you can eliminate moisture-absorption by combining silica-sachets with
    vacuum-enclosure, giving your print a good start, however, during a generally long printing proces,
    filament will be exposed to the air...

    With containers and dryers you can reduce quality problems considerably while printing, but
    slow moving and exposed filament is insufficient and the energy consumption and fire hazard
    of a print-dryer left unattended for many hours, is dangerous…

    After considering different options and combining existing products, i was still experiencing
    difficulty and it seemed to me that, to gain control over these moisture-related problems, i had
    to make my own tightly tailored printer-specific solution…

    So i designed a container with a transit channel that seals filament from the environment as
    well as possible, but also absorbs ingressing moisture in a reservoir filled with silica-granules,
    placed in the lid…

    NO (!) moisture-related problem has occurred since the installation of the filament-dispenser…
    No layer-separation, no brittle print or blob-forming due to humidity…Combined with a simple
    drying & storage-protocol, this printer add-on proved to be a problem-discarder…

    For me, this solution worked effectively, and although the design is specific for the UM2 Ext+,
    could be improved or is just obsolete, i wanted to share my findings with the community and
    be helpful in tackling a nasty problem…

    I Hope the images and files are self-explanatory, if you have any questions let me know…

    For the dutch version go to:
    https://jim-kool.jimdofree.com/actueel/sub-home/03-filament-dispenser/

    Materials and methods

    First of all, you don't have to make any alterations to your printer-housing what so ever:
    no drilling extra holes, no cutting or sawing into the body...
    The dispenser is designed to use the Ultimaker-perforations, so if you ever want to sell
    your printer, it will be original, as far as this intervention is concerned...

    The filament i used to print most parts is PET-G, but any will do ... the parts that needed to be
    flexible i used TPU-98A for which shows in the names of the STL-files...

    For glueing PET-G parts i used polyurethane glue, commonly known as foaming wood-glue,
    which works perfectly and only little is needed... these are the parts i glued together:

    Lid-grate on the dispenser-lid
    Dispenser-funnel (or filament-channel) to the dispenser body
    Fastener-plug on the lid-fastener (don’t forget the m8 nut...!)

    Hardware used is:

    1x m8 x 70mm hexagonal bolt and nut
    2x m6 x 40mm allen bolt with recessed head and matching lock-nuts and washers
    2x m6 x 30mm allen bolt with recessed head and matching lock-nuts and washers

    In the lid-fastener an m8-nut, which i forgot to show in the parts-image, needs to be embedded
    and than enclosed, so tightening and loosening of the lid can withstand wear...

    I spray-painted non-TPU parts with acrylic paint, but any finish is up to you...

    Feeding the extruder is a little different, because you can’t mount a spool, which is standard
    Ultimaker-size by-the-way, before you insert filament... there’s no room for your fingers to do
    so, so you hold the spool outside nearby the nexus, stick the filament through the funnel into
    the extruder when it is in ‘inserting new material-mode’ until it grips and then slip the spool
    over the nexus... check if the filament is within the walls of the spool, but... you’ll manage...
    To fill the lid with silica-granules i used bags of 1 kg and cut them open... i store the granules
    in a vacuum-box and take out what i need and pour them with the scoop in the wide TPU-funnel
    which i plug in the lid-grate-opening... when filled i close the grate with the plug and slide the
    lid over the bolt that sticks out of the nexus...

    - Issue #1 : Countersinks of dispenser-mount need to be scraped out

    David F. mentioned to me that the dispenser-mount in it’s unadjusted form will
    obstruct the buildplate in it’s movement...

    I assembled the dispenser over a year ago and forgot about this, however at the time
    i solved this problem by a little scraping and sanding of the mount...

    The countersinks of the bolts that go in the dispenser-mount need to be scraped out
    with a counterbore to level the heads of the bolts with the surface of the mount. In
    combination with that the surface of the mount may need sanding so that the mount
    leaves just enough clearance for the buildplate to pass...

    Of course you can redesign the mount and print it again, but in my experience it
    worked out fine...

    - Issue #2 : Nexus needs to be shortened by 4mm

    While disassembling my dispenser for alterations, i remembered there was another adjustment
    i made when i first installed it on my printer...

    Because the lid proved to be more flexible than i expected, the lid fastener pressed
    the center of the lid inside so that the space between the lid and nexus closed completely...

    The lid could then not press hard enough on the lid-gasket to sufficiently seal of the
    dispenser-body, so i took off 4 mm of the nexus on the lid-side which did the trick,
    without hindering the spool inside...

    Added:

    I have uploaded 2 STL-files (nr.19 and nr. 20) of additions that extend/elongate the dispenser about 8 mm.

    If you want to apply these alterations, take into consideration that the lid-gasket will be
    discarded and the Nexus will get a sock/shoe... also you need to replace the hexagonal bolt with an 80 mm-version...

    My filament-supplier changed the spools on which the filament is delivered with an environment-friendly version, which is broader and has a non-tubular nexus... anyway, i had to make changes to my dispenser and share these with you...

    Documents

    Issues

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    Comments

    C6f0193c25723df61ce85f3d894b5300?default=blank&size=40David F. created derived design Filament Dispenser ago
    Fe8aff430d86fa3086ffd41a9321d05a?default=blank&size=40Lion U added this to the Interesting collection ago
    Db8de2bac751bd8a45a2e2d5b7785d2f?default=blank&size=40yee379 added this to the ultimaker collection ago
    Mini imageJim Kool commented ago

    I've added a Fusion360 document nr. 21, the filament funnel stripped of all fillets, etc... Hope it's of use to those that want redesign the dispenser to fit a non-extended UM2+...

    Mini imageJim Kool commented ago

    Unfortunately not... i made the design in 123dDesign and was able to import a format into Fusion360 for storage and stl-versions, but thats it...

    C6f0193c25723df61ce85f3d894b5300?default=blank&size=40David F. commented ago

    Is there anyway you can post the native CAD file for component 1? I'm trying to redesign it so that it lines up with the feeder when you mount the dispenser on the back with a 10mm thick bracket. It's currently offset by 10mm normal to the main face of the dispenser. This would be so I can use it on my UM2+ non extended printer! Thanks in advance.

    1b8dfd89df36ee0e9fc66be8552bf356?default=blank&size=40Luis added this to the UM3 collection ago
    Mini imageJim Kool commented ago

    I have uploaded 2 STL-files of additions that extend/elongate the dispenser about 8 mm.

    If you want to apply these alterations, take into consideration that the lid-gasket will be

    discarded and the Nexus will get a sock/shoe... also you need to replace the hexagonal bolt

    with an 80 mm-version...

    My filament-supplier changed the spools on which the filament is delivered with an environment-friendly version, which is broader and has a non-tubular nexus... anyway, i had

    to make changes to my dispenser and share these with you...

    Mini imageJim Kool commented ago

    Note (!) ...

    While disassembling my dispenser for alterations, i remembered there was another adjustment i made when i first installed it on my printer...

    Because the lid proved to be more flexible than i expected, the lid fastener pressed

    the center of the lid inside so that the space between the lid and nexus closed completely...

    The lid could then not press hard enough on the lid-gasket to sufficiently seal of the

    dispenser-body, so i took off 4 mm of the nexus on the lid-side which did the trick,

    without hindering the spool inside...

    C6f0193c25723df61ce85f3d894b5300?default=blank&size=40David F. commented ago

    In case anyone is looking to use this on their UM2+ (non Extended), the distance between the spool mount and the feeder are different. Therefore the filament dispenser body fouls the feeder. I initially assumed the major dimensions between them were the same. I will need to mount the dispenser body farther down the back panel.

    5f1287f4ba4471134003284c38f51bc8?default=blank&size=40Justin T. Conroy added this to the Printer Things collection ago
    Mini imageJim Kool commented ago

    Yes, it is supposed to be printed in TPU to squeeze-fit in the larger hole of the extruder... i forgot to name the stl-file for it accordingly, sorry about that...

    It’s not essential, but it does help to optimise the functionality of the dispenser...

    C6f0193c25723df61ce85f3d894b5300?default=blank&size=40David F. commented ago

    Is the extruder plug (#13) supposed to be printed in TPU as well? Filename doesn't say so, but it appears that the dark grey parts in the exploded view are the TPU parts.

    373464ea2e2a50b9c33e5b2a6e53375f?default=blank&size=40Andrew added this to the Stuff collection ago
    Mini imageJim Kool commented ago

    Thanks, David... i hope it is of use to you...

    C6f0193c25723df61ce85f3d894b5300?default=blank&size=40David F. commented ago

    Thanks for sharing! This is a such a great idea and design.

    C6f0193c25723df61ce85f3d894b5300?default=blank&size=40David F. added this to the UM2+ collection ago
    A1dee076298ce2808c2208fb395f52c5?default=blank&size=40Curven added this to the UM2 upgrade collection ago
    Mini 1185441 10202940804545726 1332628410 nFrancesco Rodighiero added this to the UM2 collection ago
    Dcc1fa08605ddfdcbda2bc20d7a8ebfe?default=blank&size=40Werewolf added this to the Uppgrades collection ago
    Mini screen shot 2013 07 15 at 6.49.36 pmErik de Bruijn added this to the Ultimaker 2 upgrades! collection ago
    Mini imageJim Kool published this design ago