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clarkman

Is this Cura video using Dual extrusion KIT?

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Hi Clark

Welcome to the Ultimaker forum!

The video shows a quite old Cura version from over a year ago. It would look a bit different with the present version. However, support is used in the video. But the support was printed with the same material in this case. So, the answer to your question is no, it was not used (otherweise two different print temperatures would be visible).

With the present Cura version you can select the second extruder for support material. But you have to be aware that dual extrusion ist only available as an experimental kit for the UM Original and not yet for the UM2. Experimental means you must be ready to do some tweaking by yourself in order to get it running more or less properly.

If you want to buy the UM Original I generally recommend to go for the new UM Original+ which includes a heated bed and new electronics. But I don't know (yet) if the dual extrusion kit is compatible with the UM Original+; it depends on the print head being changed or not (we will know within the next few days; the UM Original+ was announced yesterday).

 

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But I don't know (yet) if the dual extrusion kit is compatible with the UM Original+; it depends on the print head being changed or not (we will know within the next few days; the UM Original+ was announced yesterday).

 

You'll run into a power-supply issue. So you cannot use heated-bed and 2 heaters at the same time. You also need so source a 2nd PT100 (which shouldn't be a huge issue) and you'll run the 2nd heater out of spec (which isn't a big issue, but does not help with the power-supply issue)

 

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That's a surprise. I thought the electronics was changed to the Ultiboard 2 which should be able to drive two hotends and a heated bed at the same time, shouldn't it?

 

The heaters in the UM2 where also changed to 25W. Which made it possible to do dual-extrusion in the UM2, but only just. If you have the bigger UM Original hotend, then that's 40W right there. If you use the 19V heater, that's 60W. I think the bed was something like 120W, and the motors and electronics use 30-40 or something. With the supply only supplying a max of 220W you go over-budget.

Initially we wanted to use a bigger powersupply. But due to regulations in the US, that powersupply suddenly changed connector, which was the biggest connector ever, which was ugly and bulky. And we couldn't change the board to hold that connector.

If you talk to our electronics guy about this, you can still see the stress on his face. Getting everything to work within the suddenly limited power budget. It was a bit like Apollo 13.

 

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I see. Interesting. So there is still no machine from Ultimaker which has a heated bed and a dual extrusion. Now I begin to understand why even you work on the UM2 dual extrusion.

Nasty story with the plug. I hope you cured the electronics guy with some chocolate cookies... ;)

 

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I thought I remembered hearing last night that the UMO upgrade (with the heated bed, new z-stage, and hot end fan enclosure) includes a new PSU, and that some basic wire stripping / soldering may be required to piggyback/power the new mini heater electronics board via the UM electronics.

This would only potentially work on an upgraded UMO since it has the two separate electronics boards, but couldn't you, in theory, use the new PSU and dedicate it to the heater board and leave the original PSU connected to the UMO electronics? You would have to plug in two PSUs but then wouldn't have a wattage issue.

 

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This would only potentially work on an upgraded UMO since it has the two separate electronics boards, but couldn't you, in theory, use the new PSU and dedicate it to the heater board and leave the original PSU connected to the UMO electronics? You would have to plug in two PSUs but then wouldn't have a wattage issue.

 

A UMO & HeatedBedKit & DualKit can be done. Then you use 2 power supplies, the new one for the heated bed, and the old one for the normal heaters+electronics. This is actually supported just fine.

A UMO+ & DualKit, that's the problem one. (No HeatedBedKit on this one as it comes with a HeatedBed per default) You only have 1 power-supply in this case. You can wire this up, but as soon as you use both heaters and the heated bed at the same time it will trigger a safety in the power supply and reset the printer. So you can print in dual-extrusion, but not when the bed is on.

You could hook up the heated bed with a 2nd power supply and a relay to work around this, but it won't work per default right now.

 

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