UBIS Hotend on an Ultimaker

[fns720 0]

Hi,

 

I have a DIY heated bed connected to my Ultimaker 1 which uses a 100k EPCOS thermistor. I'm using this setup for ages but suddenly the TEMP3 connection on Ultimaker 1's board had stopped reporting temperature values. I checked the heated bed thermistor and it is fine (I'm using and EPCOS 100k for the hotend temp detection and even if I connect my heated bed thermistor to TEMP1 it shows a proper value). I also measured the voltage on TEMP3 and it's also correct = 4.97 V.

 

I think something is wrong with the main board since neither the firmware nor the hardware parts are changed.

Do you have any idea what could cause this kind of error or how to troubleshoot further because I'm stucked?

 

[aviphysics 9]

The insulation sock slipped off during an unattended print and then filled up with PLA. On top of that, the filament seems to have been overheated and isn't softening in boiling water (which normally PLA seems to do quite nicely.

Two things.

1) How necessary is the insulation sock and what would be a suitable replacement? Maybe a strip of an old 100% cotton sock secured with heat shrink?

2) The overheated plastic seems to be super strong. I wonder if there is any way to heat treat printed parts without completely melting them.

[aviphysics 9]

Never mind about the cotton. There seems to be a risk of ignition as low as 210 C. Wool is just slightly better. Seems I need to drop by the hardware store for some fiberglass.

Edited June 11, 2015 by Guest

[lars86 42]

Has anyone tried the metal UBIS hotend?

http://printrbot.com/shop/metal-ubis-hot-end-2/

Similar clean design, with active cooling for the cold zone.