stu_le_brew

There is a problem with the materiel getting to the hot end could be caused by many different problems, below in order I would check:- 1. inside the feeder check that the pulley(s) are clean and remove any debris 2. at the hot end do a cold pull to clean the inside of the nozzle - that is manually heat the nozzle to a high temp say 220 degrees and move the filament to see it flowing, then the let it cool to about 95 degrees and manually pull the material out of the nozzle and inspect the removed filament 3. check the sate of the Teflon coupler above the nozzle, the internal hole should be round - you will need to disassemble the whole print head to access this 4. check the bowden tube lets the filament move smoothly through it good luck maybe you could post a picture of the filament feeder at the back it could help knowing which one you have a black one (oigional on UM2) or a white one more modern

It would also be helpful to know the details of your machine does it have the original UM2 black filament feeder, what is the extruder print head - the original 0.4mm or a more modern interchangeable nozzle what material are you printing with ?

I would recommend checking the SDCard - and maybe trying a different one In the past I have had a similar problem good luck

I would be interested to know some of the setting you have used - print head temperature and what material you are using does the image show the first layer ? if not does the first layer print well ? S

I can't remember exactly where I bought them but a quick search for "Micro Limit Switch Lever Arm" on Amazon (FR in my case as I live in France) brought up lots of options, but you will need to do some soldering - which is not so difficult ! example , another example just a s a mater of interest which country are you in ? S

Hi Its not a very big job to replace the micro limit switch, it is a switch that will over a long period wear as in maybe a poor connection inside. The switches work in one of two modes always open or always closed so if the controller was getting an strange signal it will fail, to protect the machine from damage. I am not sure if such a part is available from an UM supplier but I have replaced one of the other limit switches and they are very inexpensive to buy, I think I bought a pack of ten online good luck S

Firstly you should know that the fans are both 12 Volt wired in series (i.e. the power goes through one then continues through the second) so they have a 24Volt supply from the motherboard Above the print hear there is a join which can be subject to a lot of movement and often can cause breaks in one of the connections so double check here first - even moving the cables can make the fans work most of the problems I have had with my UM2 (much modified) have been problems with those fans good luck S

The first design project I used my UM2 for was a replacement outside swimming pool skimmer flap so exposed to sun wate and pool chemical's, after five years I chose to reprint and replace mainly because of alge build-up inside the print (in the spaces made because of infil during printing). The material I used is just normal PLA good luck with your choice of materials S

I would check the output from the power supply with a voltmeter to the plug for the printer S

a cold pull is usually done with whatever filament you have been using, so briefly you remove the Bowden tube, heat the head to higher than usual temp, hand push filament through the nozzle, set the temperature to a low temp (for PLA about 95degrees), then pull out the filament - it should remove any stuck filament from inside the nozzle. It can be helpful to use a different color filament for this process as you may then see the removed stuck filament

I would guess that the nozzle needs cleaning, I would try a cold pull of the nozzle good luck

Looks like a bed leveling issue to me, my suggestion would be to try re-leveling the bed Good luck You could also try moving the part to a different place on the bed

I would try copying the files on to your computer and then re formatting the SD card, return the files to the SD and try again, I have had similar problems which the above resolved Good luck, also for the business too

an important place to start is to let every one here ( who might be interested in buying your printer) where you are located n the world !!!

hope it stays fixed good luck