I simply don’t have enough space to run the U1 with the side spools and feeder attached on the sides but I’d still like to use the feeders and RFID filament recognition. I have a Ikea Bror Shelf setup with spool rollers in boxes for 4 filament spolls on top and I’d like to put the U1 in there but li…

Yes, these are the original coils, just moved outside for testing purposes. [image] Hauke: this frequency may require a shielded coaxial cable for longer distances Interesting idea, I didn’t think of that, since the short ~ 20cm original cables also didn’t have any shielding. I have cat5e la…

CAT5e would be the wrong choice I suppose - you’d need coaxial cable like this: https://www.bradyid.com/rfid-readers/antennas/rfid-antenna-cable-sma-male-to-rp-sma-for-fr22-fixed-rfid-reader-cps-4406215?part-number=fr22-ant-cable-10m i.e. it consists of a central wire plus shielding. Still, if you h…

I don’t know specifically for this antenna, but I have done antenna tuning in general. Indeed if it’s a resonant design, then changing the lead length may cause it to become insensitive to the specific pickup frequency. Not helpful, I know. :sweat_smile:

You can get USB oscilloscopes for pretty cheap these days. You no longer need a $10,000 fluke ‘scope. Just make sure it can more than 13.56 MHz. So not a $20 scope, but a $100 scope looks like it’ll do you. Even if you’re not a electrical engineer, that’ll likely give you some information. If t…

Thx for the info about oscillosocpe. I wish I had more time and motivation at the moment to look into that as the whole thing sounds interesting. I received connectors for jst gh1.25 yesterday, so I can try out different cables, plugs and lengths. Maybe also the microfit plug I added is not ideal, b…

The feeders should be much simpler - strong, low frequency, digital signals - usually robust against cable length if you talk a few meters max.

Yes. The feeders should be more trivial so long as the connectors are good and it’s not a super long cable that degrades it too much or picks up interference.

So I did some testing today with shorter cables and cat5e cable. The longest I was able to extend the default ~20cm cables was +40cm….so too short for my use case. I need min. +80cm. It made no difference if I used normal cable twisted, or cat5e cable. I don’t think I’m able to retune the frequency…

Someone made the point that you need to use something like coaxial cable, not cat5/6. Huge difference in shielding! Whether they helps you or not, I can’t answer but if you can find coaxial you need to try that before giving up…

I think there’s a good chance that the coaxial cable will do the trick - these cables are made for high frequencies and have the necessary electrical characteristica. However, they may require additional components to avoid reflections of waves at the cable ends - usually 2 resistors, one at each ca…

How to extend RFID coils?

U1 Toolchanger

VGer March 25, 2026, 9:11am 20

You can find 60cm feeder extension cables at:

Extension cable for auto-load(feeder) module

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How to extend RFID coils?

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