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Watts-on's "SpringSlot" 18650 Battery Holder
#71
Why do you need the nubs? You could simply loop the elastic around the cell holder, and under the screw on the far side. Yes you'd loose some force since it won't be doubled up, but how much force do you really need?
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#72
(04-05-2019, 02:04 PM)Lucan Wrote: Why do you need the nubs? You could simply loop the elastic around the cell holder, and under the screw on the far side. Yes you'd loose some force since it won't be doubled up, but how much force do you really need?

I you anchored the bands to the screw that secures the holder you will end up with the elastics pulling the lever to the open position.
The nubs provide for a proper angle resulting in the lever being pulled towards the cell rather than away from.

If the elastics were in front of the pivot point this might work, but I think then they would also be in the way.

The elastic was doubled over because I used a large elastic instead of a small one.
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#73
(04-04-2019, 09:51 PM)brettwatty Wrote: ...Nice work mate. Your 3D printing / CAD skill are next level mate Smile
Thanks mate. I'm strictly amateur, but having fun with it.   Big Grin

(04-04-2019, 08:35 PM)Bubba Wrote: IT WORKS single handed.

Great news! thanks for reporting back.  Smile

(04-04-2019, 08:35 PM)Bubba Wrote: 2. If you move the hole on the lever up a couple of mm you might get better contact at the center of the cell.
Not sure I follow?

(04-04-2019, 08:35 PM)Bubba Wrote: 3. I find the lever doesn't go down into the tiny groves for the prongs on the lever.  You could move the base mounting hole at the negative terminal and make the lifter all the way across.  That being the part of the lever that rests under the cell would be thicker.
Hmm, I left the hole in that location because it makes it compatible with the commercial single slot cell holder's mounting holes. I could sure add more clearance for the prongs though..

(04-04-2019, 08:35 PM)Bubba Wrote: 4. I found the walls to be stronger on this iteration than the previous ones.  i.e. above the posts for the rubber bands and the lever itself.
I thickened the walls of the lever since it now has to support the force of the pivot, but I don't think I altered the walls of the main body.

(04-04-2019, 08:35 PM)Bubba Wrote: 5. The little overhang on the lever (where the elastic goes through) broke off on first use since it's a bit weak there.  But isn't necessary.  See the pics.
I've beefed it up a bit now.

(04-05-2019, 02:04 PM)Lucan Wrote: Why do you need the nubs? You could simply loop the elastic around the cell holder, and under the screw on the far side. Yes you'd loose some force since it won't be doubled up, but how much force do you really need?

I was thinking exactly the same thing, so I came up with another version:



The nubs on the end ensure the elastic is held low down to ensure they pull form the correct angle.
You can wrap the elastic right round the whole thing, or hook the ends onto the positive terminal screw ( may be worth putting some heat-shrink on the thread if using that method so the threads don't damage the elastic).
Still needs to be printed with some supports though.

.stl file attached..


Attached Files
.zip   SpringSlot_Elastic_Latching_Ver2.zip (Size: 62.06 KB / Downloads: 34)
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#74
Following a request from another user, I have created a quad version of the SpringSlot, that will fit the footprint (apart from the levers) of the commercially available quad (4-gang) type, like this:







The levers are slightly narrower than the single slot ones so are incompable.
I haven't 3D printed this myself to check the dimensions / fit, so please report back any problems.



 



.slt files attached.
CrankyCoder likes this post


Attached Files
.zip   Sprint_Slot_Quad_Ver1.zip (Size: 4.09 MB / Downloads: 7)
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#75
AHHHHH YOU ARE MY HERO!!!!!!!

Downloading right now!  I am soooo happy im working from home today.  Starting a print right now!

Thank you!
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