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tobbelobb / hangprinter

A RepRap hanging from the ceiling
GNU General Public License v2.0
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Implemented line-separation on spools #23

Closed gehringer closed 6 years ago

gehringer commented 6 years ago

Separating the lines on a spool might prevent them from tangling. I experimented with different solutions (stacking etc.) but ended up with keeping them on the same spool, i.e. same diameter, just separating them by "separation discs". Works on the same base.

Not the most elegant way perhaps but printing works. These separation discs "lock" by a slight turn an can be locked by securing the line in the center of the spool (after passing through a whole in the separating disc).

Happy hangprinting! chris

tobbelobb commented 6 years ago

Hi Chris! I won't merge this just yet, but I can help you develop it. To slide a separation disc onto the spool is a good idea, I think. It could make the spool buildup more predictable :)

Are you sure you need the grooves highlighted in red here: separation_disc_grooves ? I think the spool_separation_disc might be so flexible that you can mount it even without the vertical grooves.

I encourage you to try to render a full ceiling unit with the new parts using the layout.scad file. Since several parts depend on the changed parameter Spool_height, do a make all to get stls that are up to date with current parameters.

To make this work well, you would need a total of 9 linerollers of 5 different heights on the ceiling unit. You need lineroller_D of different 3 heights, and lineroller_ABC_winch of 2 different heights. The different heights are needed in order to make lines enter horizontally onto the middle their respective spool sections. See lh and dh(n) in spool.scad for help with calculating these 5 different heights.

gehringer commented 6 years ago

Hi Tobben,

thanks for your detailed feedback and you're right, it's not ready yet. I forgot about the line rollers since I plan to put things differently on my tripod. But I'll work on it for full integration..

You're also right that the disc can be mounted without the wholes but I just wanted to be sure that each line has only their share of the spool, i.e. 1/2 (1/3 for D spools), to not loose the possible gain in accuracy/predictability. I guess this can be easily tested and discarded if not necessary.

Kind regards, c

tobbelobb commented 6 years ago

Looking greatly forward to see you build :)

I meant keeping the holes, but removing the tracks. This would require bending the separator disc when mounting it, but it could maybe reduce the risk of the disc coming loose once mounted?