stu_le_brew

great news it sorted re the BondTech, I periodically open and clean the feeder gears to remove filament debris with a stiff brush (not metal) - seems to help with extrusion when I have problems good luck

I once had something vaguely similar to this which turned out to be the SDCard - it had errors on it (my printer is an UM2 hence SDCard not USB) This was fixed after I re-formatted the card it may be worth checking the USB stick for errors

It look like a problem with the z axis to me maybe you need to clean and lubricated both the Z thread and the vertical shafts One other thought, depending on your feeder (I have a BondTech feeder) sometimes the internal feeder gears benefit from cleaning

be sure that Cura has finished writing the file to the SD card before you remove it from your computer you can also open the Gcode file on the SD card in cura (it will open in layers mode) if this works OK then it must be a problem with your printer good luck and welcome to the forum

just a thought - could it be due to variation in the temperature sensor between the two printers ? It looks like your printing too hot to me interesting design too

Didier's website/shop is http://www.ideato3d.be/ he does sell both of the fans

lots of parameters to be considered here (maybe to many to get to an answer ?) nozzle diameter and type (example brass, stainless steel or even ruby tipped) type of materiel even variety of print head I can think of at least three for the UM2 heat capacity of the head heater (two or three variants for the UM2) the list goes on and on ..... then you will need to consider the build quality/detail resolution you want to achieve, as the absolute best build quality starts with a small nozzle and is better if printed slowly

Thanks for that info Thanks for that info ultiarjan, PM sent

wonder if anyone here knows were to buy the Mark2 pcb ??

I used to have this problem in particular with the last 10-15% of filament on a reel, completely fixed when I changed to a BondTeck extruder feeder, I am also sure the new geared feeder from Ultimaker would solve the problem

I have been using the Everlast nozzles on my UM2 - mainly with wood and bronze materiel with very good results (I have three different sizes 0.25,0.40 and 0.60) The UM2 Everlast nozzles are either ruby or saphire, what also makes them work well is the internal design of the nozzle. I hope everyone is OK with an English reply, translation below just in case it helps J'ai utilisé les bus Everlast sur mon UM2 - principalement avec du matériel en bois et en bronze avec de très bons résultats (j'ai trois tailles différentes 0,25,0.40 et 0.60) Les buses UM2 Everlast sont ruby ou saphire, ce qui les rend également efficaces, c'est la conception interne de la buse. J'espère que tout le monde est bien avec une réponse en anglais, traduction ci-dessous au cas où cela aidera

One thought, have you tried re-connecting the old fan ?

Its hard to say but in my experience (more than three years with UM2) the Teflon coupler I have replaced several times but since I installed an 'I2K' spacer from 3D-Solex I have not had to replace the Teflon piece again, now more than 600hrs since last change. I suppose you may need to replace the Teflon Bowden tube occasionally, in my case I have replaced once. Also the print nozzles can wear out from printing abrasive materiel, like metals filaments

I think posting photos of the print could help people with diagnosis also you could update your profile to indicate where you are in the world - it could be that some one could be very nearby and could help ?

Hi Bob, I just love the Matchless block, its seems like it has a non slip interior (which I know it hasn't) but the need to do Atomic cleans just seems unnecessary, I am very pleased with it. I waited for a while after it was released before ordering it so mine, it seems absolutely fine - just thinking about the original UM print head seems like a piece of history now I am also waiting for the 2nd extruder mod, I have several Olson blocks that I plan to use for that

I just noticed that the new nozzles are now available everlast-um2-nozzles

good luck with your search for help, I am too far away from you (Lot department of France)

It is the new UM2 ones I have been testing

I have recently been testing some new " EVERLAST " nozzles with Ruby/Sapphire tips based on the "Matchless" nozzle for the UM2, so far my favourite is the 0.6mm it just flows so well. The need to do an Atomic clean is greatly reduced only necessary if changing materiel type, so just a different colour of PLA no problem. The combination of the new nozzle and " Matchless" print head do not seem to hang on to filament at all - a really exciting step forward especially for abrasive materiels I still find it very amusing that the Matchless nozzle gives a snake tongue look when a cold pull (atomic pull) is done ! This is a great step forward - more great work by @Swordriff, not sure when these are to be released ?

I have been testing some new " EVERLAST " nozzles with Ruby/Sapphire tips based on the "Matchless" nozzle for the UM2, so far my favourite is the 0.6mm it just flows so well. The need to do an Atomic clean is greatly reduced only necessary if changing materiel type, so just a different colour of PLA no problem. The combination of the new nozzle and " Matchless" print head do not seem to hang on to filament at all This is a great step forward - more great work by @Swordriff

have you tried adjusting the tension on the extruder, looking at the list of things above I am sure you have

my first thought would be to try lowering the print head temperature a little, then maybe increase the cooling fans a bit. but that is without any knowledge of your current settings so that may be not relevant ? good luck

+1 vote for the BondTech feeder, its the best upgrade I have made oh! but also the Olsson block too and there is the more powerful heater

what a relief for you, good luck