JASP - load cell spool holder

Got any crazy ideas?
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Knickohr
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JASP - load cell spool holder

Post by Knickohr » Fri Jun 16, 2017 11:46 am

ASP - Just another spool holder

But -this spool holder is special !

It has an load cell implemented :D

The theory :

Load cell - an electronic device for measuring the weight of something. In this case the filament spool. You can calculate the leftover length of the filament if you know the weight and the specific density of the material.

The weight is proportional to the resistance of the load cell, its also proportional to the voltage, finally you got an value for calculation the leftover length of the filament on the spool. Of course we measure the spool and the printed parts too, but we can substitute it, because they are well known.

You can buy cheap load cells with A/D converters from eBay.
I recommend an load cell with max. 3kg for 1kg spools and a cell with max 5kg for the big 3kg spools. I bought an 2kg cell, its just at the end of the max. range !

OK, there is an display missing. I have some OLEDs in spare which I bought for some months.

The "rest" is an Atmega with some BASCOM coding ;)

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https://youtu.be/juuylDFF6k8

Thomas

Ariel
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Re: JASP - load cell spool holder

Post by Ariel » Fri Jun 16, 2017 3:52 pm

that's a neat idea, watch out though, spool weights vary, and not always the filament weight is absolute, can be 20 grams off at times!
neat idea though, keep us posted
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Knickohr
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Re: JASP - load cell spool holder

Post by Knickohr » Mon Jun 19, 2017 10:51 am

No Problem,

the scale has an TARA-Button (red button). OK; maybe the spools (from the same brand) are a little bit different. If filament goes empty, the last few meters, it's better to use your brain and doublecheck it there is enough filament left on the spool ;)

Thomas

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kojote
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Re: JASP - load cell spool holder

Post by kojote » Mon Jun 19, 2017 12:07 pm

Totally love this idea, thx for experimenting with it
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Knickohr
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Re: JASP - load cell spool holder

Post by Knickohr » Tue Jun 20, 2017 3:42 pm

Print your own load cell spool holder ?

https://www.thingiverse.com/thing:2272321

Thomas

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