kvones

Looking to print this material on my UM+ too - how did it work/ behave otherwise? What temp were you printing at and how much retraction did you need?

It would take a lot more heat than the flame from a gas stove to melt the nozzle - remember the whole piece would have to reach that temp at the same time to start the melting process and it's way too thick for that. And using the brass wire attachment on the dremel is good advice, although I would use a hand brass brush instead as its less fierce. Also, you could make a small acid bath to get rid of burnt debris on the nozzle. I am a jeweller and that is how we get rid of soldering flux etc after heating. We call the acid used 'safety pickle' - it's very weak sulphuric acid and can be kept in a ceramic slow cooker at a low constant temperature. Go to a jewellery supply store, they should be able to help. This will definitely get rid of any soot etc, after heating the nozzle and burning out the filament.

I will take a photo of my assembly to post. I have used the black c bone piece on the end groove of the knurled bolt as per instructions. How tight should this piece be between the feeder and bolt? If I screw the feeder wheel on I can adjust it so it's either quite tight or looser, but it doesn't seem to make much difference. It just works its way out after a few prints, especially ones with lots of retraction. I have used the two slightly fatter washers inside the assembly, and then the slightly thinner washer on the end before the nut. However, I have also tried leaving the washer off, to give the nut more screw space. Currently using it without the last washer. The nut definitely turns with the feeder gear, I have tested for that.

Hello, I have just finished building my UM+ and have encountered a weird problem while doing first test prints. After each 5 or so prints, the material feeder literally falls apart - the big metal nut on the end comes off, and then the gear wheel falls off, stopping extrusion. Is this something that 'just happens' or did I make a mistake somewhere putting it together? So far I have fixed it by just screwing the gear back on and fastening the nut but it keeps happening....

Very interesting! I am looking to build a similar setup with a syringe and a non-captive linear stepper motor for my UMO+ to do paste extrusion. I am struggling a bit to figure out exactly what electrical specifications (current, Voltage etc) my stepper needs to adhere to in order to plug directly into the UMO+ electronics and work (I think they are the same as UM2's). Could you shed some light on this for me? Also, how much does your direct extrusion print setup weigh?

Hello All, I am trying to develop a syringe print head extruder based on the stepper driven Fab @ home design for the model 1 single syringe extruder for my Ultimaker +. http://www.fabathome.org/wiki/index.php?title=Model_1_1-Syringe_Tool#Model_1_1-Syringe_Tool_Assembly_Diagrams This design works with a non-captive shaft linear stepper motor driving the plug inside the syringe directly and pushing material out in a very similar way to the filament deposition method. I know there are a few designs out there just using the filament melted directly onto the plug of the syringe, but I am interested in the more precise stepper driven approach, also with a view to using it as an alternative dual extrusion head. Now my questions to the forum: I believe the dual extrusion kit won't work on the UM+ because of the heat generated and the power load drawn by the hot end. This will not be an issue for the syringe extruder. Is there enough space/power on the electronics of the UM+ to drive an additional stepper? If so, which port should be used, and what specifications in terms of current and load should the stepper have? Would either one of these two work? http://www.zappautomation.co.uk/electrical-products/stepper-motors/linear-stepper-motor/sy17sth0404-100tr8x8-non.html http://www.zappautomation.co.uk/electrical-products/stepper-motors/linear-stepper-motor/sy8sth30-0504-100tr35x061-non-non-captive-linear-stepper-motor.html Finally, how might I be able to tell the UM which extruder to use at what point? Would this be handled by Cura? Any help/input would be much appreciated!!!

I am having the same experience with my UM+ kit. Parts missing are almost identical to OP. It's really frustrating, waited 3 months for my kit and now there will be further delays in completing it while waiting for parts. Unfortunately we have no decent electronics/hardware store in my home town, so will have to wait for UM to send missing parts. And no labelling on the bags has left me guessing too many times, taking lots of extra time. There are many parts in my kit which have never been mentioned in the instructions and I cant figure out what they are for. Four black plastic squares from the molded parts in particular, can anyone enlighten me?