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joan.t
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Prusa Support, Echat, excellent

Mon Feb 19, 2018 12:10 pm

I had a heatbed thermal runaway today on my Mk3, followed by preheat errors as the heat bed failed to heat.

I checked what I could, and proposed a failed power wire in the heatbed cable bundle.

I contacted Prusa support via echat, and 'Ondrej' confirmed my diagnosis, and promised to send a replacement heatbed in tomorrow's deliveries, all within 19 minutes...


this was excellent service.

regards Joan
I try to make suggestions that I believe to be well founded and safe,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions,
what you do, is YOUR responsibility.

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BillCampbell
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Re: Prusa Support, Echat, excellent

Mon Feb 19, 2018 3:33 pm

Joan,

I know exactly what you mean. I had a problem on 12 Feb with my second Mk2S and used echat to discuss it with Peter. Almost immediately diagnosed and confirmed as a faulty thermistor. The replacement arrived in rural Philippines today.

Helpful attitude, polite and efficient service - I give Prusa echat team 11 out of 10.
Bill
Tagaytay City, Philippines
Founder member of Philippines Prusa Printer Owners FB Group
Sponsor Pillars of God Academy in Bacoor

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joan.t
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Re: Prusa Support, Echat, excellent

Fri Feb 23, 2018 10:47 pm

Despite UPS couriers best efforts to muck up my delivery, the parts were dropped off at a collection point Yesterday... UPS just didn't bother telling me...
20180223_203912[1].jpg
20180223_203912[1].jpg (1.51 MiB) Viewed 243 times
this is what happenned to my heatbed! caused by flexing of the cable loom, and stiffness of the power cables
20180223_200218[1].jpg
20180223_200218[1].jpg (2.08 MiB) Viewed 243 times
the replacement parts included a replacement heat bed, with revised cable grip, to reduce cable flexing at the heatbed connections.

I refitted the new parts and my printer is back in service
20180223_204530[1].jpg
20180223_204530[1].jpg (2.25 MiB) Viewed 243 times
the wires on the left are the standard Prusa power cables, they have a higher than average conductor count (approximately 22 individual strands in the bundle rather than 7 in a less flexible cable) I would rather use wires like on the right, these are flexible silicone rubber insulated wires, with 252 individual conductors and a current rating of 22Amps, which should be adequate for the job

regards Joan
I try to make suggestions that I believe to be well founded and safe,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions,
what you do, is YOUR responsibility.

greg.g2
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Re: Prusa Support, Echat, excellent

Sun Feb 25, 2018 5:57 pm

Have to agree - all those folks should get an extra ration of gummy bears !!!

curtis.c2
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Re: Prusa Support, Echat, excellent

Thu Mar 01, 2018 7:32 pm

joan.t wrote:
Fri Feb 23, 2018 10:47 pm
I would rather use wires like on the right, these are flexible silicone rubber insulated wires, with 252 individual conductors and a current rating of 22Amps, which should be adequate for the job
agreed, my bed wires snapped as well and I replaced them with 16ga silicone wire from amazon.

I almost would rather have some sort of terminal block on the bed itself, soldering on it is a huge pain.

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joan.t
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Re: Prusa Support, Echat, excellent

Thu Mar 01, 2018 10:08 pm

Agreed Curtis, soldering these wires on is a bit of a beast

mind you, a decent soldering iron makes the task easier

Mine is an old 50 watt temperature controlled soldering iron with a chunky bit

I wouldn't even try a 10 watt antex soldering iron,you would be more likely to damage the PCB than solder the wires...

regards Joan
I try to make suggestions that I believe to be well founded and safe,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions,
what you do, is YOUR responsibility.

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