tfg

Update: I've followed the troubleshooting advice on the UM Error pages and swapped the connectors over between TEMP1 and TEMP3. The error then becomes a simple MAXTEMP displayed on the Ulticontroller, so from this I assume that the fault lies with the bed rather than the control board(s). So I've stripped the bed down and checked the resistances across the various connections and terminals. Measured at the tails at the back of the connector block on the heated bed plate, the PT100 sensor is showing a steady 108.3 ohms at approx. 19C room temperature. The main heater track gives a reading of 3.2-3.3 ohms, but as that has been heating up OK I don't think there's a problem. Both of the sensor wires that run from the bed to the heater control board show very good continuity. The 3-pin cable running from the heater board to the main board also shows good continuity for all wires, even when I measure across pins on the boards sockets. I'm running out of ideas here. Any ideas where the fault may lie?

First post on the forum, even though I've been signed up here for quite a while. So - hello to everyone. I bought a UMO kit in July 2012. Then life got in the way. So I only started to build it late last year. By then, I'd added an Ultimaker HBK kit to the pile, so that got included as I built the kit, along with a Flex3Drive head, as the head construction that was part of the original kit didn't match the instructions (I think it was a very early version of the head) and it didn't look as though it would work well anyway. Last week, I finally got to the point were I could power it all up. Everything seemed to work, at least in basic function. It turned out that the glass bed plate wasn't flat, so I had to make some modifications, but that seems better now. When I was bed levelling, I pre-heated the nozzle and bed to the default operating temperatures. Everything seemed to be working OK, then the Ulticontroller showed a "MAXTEMP BED" error. I switched everything off and reset. Initially, it would still pre-heat the bed to about 80-85C (target temperature was set at 95C), then the temperature readings would vary wildly for a few seconds, then the error would flag up. Now, the error is permanently on, even when the bed is cold. Also, when I view Pronterface, it connects and shows the nozzle and bed temperatures in the title bar as approx. room temperature for the nozzle, but 1,100C (!) for the bed. It also permanently indicates "Detecting baud rate", but never establishes a connection. Resistance across the bed temperature sensor is showing around 110 or 111 ohms when at room temperature. I seem to be going backwards with getting the printer to run. What's my best course of action?! Matt

The hot ends I've got are v1, which just has a threaded brass tube coming out of the top of the alumiminium block. There's no stepped brass collar - the knurled PEEK part just screws on to the brass thread. Things seemd to have moved on quite a bit since then.... I had a look on the Wiki pages, but couldn't find any 'archived' assembly instructions?

My first post on the forum, so hello to all. I've read this thread with some interest. My situation is probably a little different to most and I'm seeking a little advice from Those In The Know: I bought a UM kit (what's now the Original, by the looks of things) in July 2012. Work and other commitments then delayed the building of it a bit - I've only just started putting it together :-| . The downloaded assembly instructions for the current Original have seen me through, until I came to the hot end assembly. There are several detail differences between the parts in my kit and what's in the instructions. In searching for answers, I read various blog posts that lead amongst others, to this thread. The E3D v6 looks like a very worthwhile upgrade to the UM v1 hot end that I've got (still in its little plastic bag). It appears to be an area where a lot of development work has taken place in the past 2-3 years. So - can anyone recommend the least painful path to fitting the E3Dv6 kit to the UM 'original', preferably retaining the bowden-type feed, heater block & cartridge? The quality of the E3D parts look very good. I like the look of the combined axis mounts/cooling fan adaptor(s) that I see in R4ix's, Tommyph1208 & anon4321's gallery/thread photos. There is a bit of chicken-and-egg for me though, in that I can't print one of these mountings until my UM is up and running! :unsure: