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All So I thought I would share an update. While I still haven't received my new block from gr5 I did find my "old" original block (the one that came with the machine). It still had the nozzle - all covered in filament - inserted so I decided to give it another try. I did not print the Olsson wrench before I started to experiment so I thought that perhaps the first leak were caused by my inexperience and the fact that I hadn't tightened the nozzle correctly. I heated the block/nozzle with a heat gun and mounted the block along with a new nozzle in my printer. My printer now prints with out leaking! In fact - it prints beautiful! All in all - a lesson learned for me! Everyone - thanks for all your comments, advise etc. thanks, Robert

Hi SandervG Thanks for your reply. I've followed yours and krys' advise and ordered an Olsson Block from gr5. That said - I'm still struggling to understand what in this block can make such a huge difference. The block's I have bought - some came with the wrench and tools both look and "feel" OK. I can't tell the difference and when I install the nozzle (before installing it) once the nozzle is in it feels tight and don't move at all. When I remove or change nozzle I do remove material and keep the block hot while I change the nozzle. Once the nozzle is changed I re level the build plate and insert filament. As I've indicated above - in one scenario I changed everything block, thermo coupler/steel coupler and nozzle Tighten everything (hot) with the Olsson wrench. Even that combo leaked immediately. I am aware that printing with a wrong nozzle compared what the slicer assumed is a no no so I don't do that but I did speculate whether somehow the feeder fed to much material to the nozzle (such that excess material had to be pushed out elsewhere) but I've tried to reduce flow and don't see a difference. By the way - I have measured the width of the material that's extruded prior to a print and for a 0.4 mm nozzle it's 0.48mm. Not sure whether that's to be expected.

Again - Thanks for all the response and support. DidierKlein. I did not contact the seller about the issue. For a couple of reasons. I'm new to 3D printing and was assuming that I did something wrong. I did have issues with the nozzle dragging through my prints etc and at some point I changed my 0.4mm nozzle with the 0.8mm that came with the printer and I then changed both nozzle and block a couple of times and - I lost track of which are which. Am I sure it's a leak? Yes. 100%. I can sit and almost watch as it leaks out. At 230C (PLA) it takes 5 minutes - then I can see the material and within 20 minutes I need to pause and "clean" away the material. (I sometimes reduce the temperature once the bottom layer is done to ~190C and it does by me an additional ~10 minutes :-) SandervG I have not been able to verify the torque that my tool uses. I'm open to the possibilities of the Chinese block's doesn't meet some spec that the block Ultimaker delivers. Keep in mind though - I've tried at least 3 blocks and several nozzles. Regarding the pictures. Yes there is a gap. I'm not sure if mine looks different (and in the context of leak) what could be different. The nozzle seem to fit well into the block. All that said - perhaps my question to the forum is. When you replace the Olsson block - where do you buy them? And do you know what parameter to pay attention to?

All Thanks for all the replies. Here are answers to the questions: DidierKlein : With respect to the leakage - the only place it can leak is through the thread between the nozzle and the Olsson clock. (I'll try to attach a picture) Where did I buy the replacement parts: I bought the Nozzles where I could find them (including eBay). Yes - they are undoubtedly mostly from China but then again - I did have leakage from the original block/nozzle that came with the printer. krys & ultiarjan : Yes I did tighten the nozzle with the Olsson when it was hot. I don't remember the temperature but I usually heat the nozzle to 220C or 230C. The wrench was printed with PLA and 100% infill as recommended. I have however not been able to verify the torque.

I've seen several people discussing leaking nozzle on this forum. Unfortunately I haven't found the solution to my problem reading through the replies. I have a Ultimaker 2+ and I use Cura 2.3.1. I've had the printer for ~ 6 month and I've had the problem for a long time but I'm not sure when it really started. When I print something (either using PLA or PETG) material leaks out through the thread between the Olsson block and the nozzle. At this time I believe I've tried almost everything but without luck. I have tried different material (PLA & PETG and different vendors - eSUN, GizmoDorks and Ultimakers) - no difference. I have made sure that the nozzle is tighten using the Olsson wrench. That didn't help either; I even went one step further and tighten the nozzle - a tad more. Still - material leaks. I have tried generating the G-CODE file both with Cura 2.3.1 and the "old" Cura 15.04.6. Same result (which didn't surprise be - but I thought I should give it a try) I have tried different Nozzle sizes (0.4 mm and 0.8 mm). No difference. I have tried adjusting the Flow. I'm not exactly sure what the Flow settings does but I guessed it reduced the amount of material fed to the block. Still - leaking. I have replaced the Nozzle. I have replaced the Block and even the Thermocoupler. No difference ! It still leaks. I even replaced all of the above all at once (so everything were "new") but still it leaks through the thread between Nozzle and Block. Now - I do admit that the Olsson Block and the Nozzle I've used for replacement is not the "original" block. I don't see the Olsson Block for sale on Ultimakers website so I've bought what I could find online from other resellers. Any suggestion what else I could do would be greatly appreciated. As it is now - I have to clean my nozzle every ~ 30 minutes and that's even after I lowered the temperature to ~ 190C for PLA. thanks, Robert