V3DPrinting

Good news! The print completed in 2h20 without any issues, printing with the Hardcore + 0.6 Everlast nozzle So the problem was too much moisture in the filament.

I have finally managed to make the test. I am successfully printing ColorFabb PA CF with an 3d Solex Hardcore + 0.6 Everlast nozzle for now more than 1h without any flaws on an UM3. The part is a gear printed at 150 microns layer height, 270°C printing temperature, 50°C Bed, 70 mm/s print speed with infill speed at 40 mm/s, fan 20%. So with the same parameters as in the failed tests. The only difference is the spool had been dried for 6 hours at 70°C early this week and kept in a sealed bag or a dry box since. BTW, the print surface is very good now, which wasn't the case previously. There is a direct relationship between the level of moisture in the filament and the softening of the filament. This led to print core jamming in the previous tests with that particular filament. So ensure that the ColorFabb PA CF is very dry before starting any print with the Hardcore.

I have dried the filament for 6 hours at 70°C on Monday. I have made a perfect 2h print with it on my printer with E3D V6. So there is a relationship between moisture and softening temperature. Filament needs to be very dry in order not to soften too much. I still need to do a test on UM with the Hardcore. I expect to do it this afternoon

I am now facing the same jamming issues on my printer with E3D V6, but after 1 hour printing approx. Parts which printed well on wednesday are now jamming the hotend (0.2 mm layer height, 280°C, Bed 50°C, speed 40mm/s) Same for parts printed at 0,15mm layer height, 270°C, speed 40 mm/s I have lowered the temp to 265°C for 0,15mm layer height keeping speed at 40 mm/s in order to maintain the flow. I have also opened the front of the printer to decrease the temp of the air cooling the hotend. Still jamming the hotend after 1 hour printing. That confirms the fact that the filament itself is drawing up the heat past the heatbreak, as the E3D V6 are very good hotends. The spool has been opened in may '18 and kept in a dry box, even when printing. There might be some slight moisture in the filament as the surface finish is not as good as the very first print done in May. I am wondering if there is a relationship between the softening temperature and moisture level in the filament. I will dry the spool tomorrow Any help appreciated.

John It is not easy to create the right conditions with that material as print speed is pretty low (30 - 40 mm/s) and temp pretty high 280°C for a 0,2 mm layer height. Increasing the nozzle diameter will lead to a temp increase so increase the problem. I print some grades of ABS at high temp : 270°C with the 3D Solex hardcore. No issues at all. Of course it's with a standard 0,4 brass nozzle, but it doesn't have any impact on the current problem. I have also printed ColorFabb HT on UM3 with the Hardcore without issues. Printing Temp is also 270°C To me it is the material itself who creates the problem first. Then maybe the thermal dissipation of Hardcore + fans is not sufficient and the filament above the heatbreak reaches the glass transition temperature, softens and jams the print core. So I am curious to see in details the Printcore CC to understand how they overcome that challenge.

No it's a single extrusion job, so only one print core involved. Here's a picture of the old version 2017 on the left and the new one 2018 on the right. Less fins on the new version. And less than the original Printcore. Agreed. Maybe gluing thermistors on the dissipator would give some indications, but that means testing equipment and time. Being a service provider, I don't have the time for that. Yes maybe Carl @swordriff or @gr5 have an idea on how to solve the problem, linked to that particular filament. I haven't tried yet Glass Fiber filled nylon, but I may as I'm working on some replacement parts with a customer that requires XSTRAND GF30 PA. I know it has been qualified on the UM S5 and some material settings are available, so it works with the PrintCore CC at least. It would be good if it also works on the Hardcore with Everlast 0,6 nozzle, as I already have it.

As the issue appears in the very first layers and the nozzle itself is not clogged at all, the print core is not cooling properly for that special filament. Or more precisely, the filament thermal conductivity is much higher so the heat is building up in the filament more easily. I printed the same part on UM S5, same settings or so, same print core but standard 0.6 brass nozzle, with ColorFabb PA Neat without any issues. Interesting. I have managed to print a bigger part with PA CF at 0.1 layer height with an E3D v6 and 0.6 nozzle without any clogging or jamming issue. The only point was that some carbon fiber was more visible on the surface. Same for the part I have tried yesterday at 0.15 layer height. Less carbon fiber visible though. When ColorFabb released initially the material, recommended layer height was 0.15 but nozzle was not specified. As the main problem with filled materials is the filling clogging the nozzle, using an higher bore nozzle helps a lot. Yes my printers are enclosed on the front and top, but the top is left open, so the heat is not accumulating. As as the first attempt on UM3 was already having these issues, I have checked and cleaned the printcore cooling fan before starting the second attempt on UM S5 My though is the cooling on the hardcore is not sufficient for that special filament, as there are less fins on the cooling part and maybe the print head fan is not that efficient for the two print cores to be cooled. I am curious to see the Printcore CC and reviews printing ColorFabb PA CF with it.

On UM3 I have Bondtech QR 3.0 extruders. On UM S5, my last attempt it's stock. Layer height is 150 microns, bed 50°C nozzle 270°C. I've used the standard speeds for Nylon settings in both cases.

Hi I am trying to print Carbon Filled PA from ColorFabb on my Ultimaker 3 and Ultimaker S5, but I am having some jamming in the print core. I am using 3d Solex Hardcore with an EverLast 0.6 nozzle. The heat builds up in the hardcore, so the filament softens well after the heat break and jams the hardcore up to the bowden tube if the print is left unattended. It is my second attempt, on the first one the Hardcore was new and after some tests was not able to print even with PLA due to a defect in the heatbreak, Thanks to Carl from 3d Solex, the issue had been fixed very quickly and efficiently. This second attempt, I took an Hardcore which was performing well with a 0,6 brass nozzle, swapped the nozzle by a 0,6 Everlast nozzle and started to print. Anyone had the same issues ? Anyone printing ColorFabb PA CF on Ultimaker ? I've ended printing the customer order on a printer with E3D V6 and hardened steel 0,6 nozzle, printing like a charm.

Too tight....

The reason why I wanted some Z offset is because, even if the leveling has improved a bit, the first layer is too thought. I use also a mesh bed leveling on a Duet3d powered printer for more than a year, and I like the ability of baby stepping. It helps fine tune the first layer specially with materials that require high temp nozzle and bed. It would be good to have the G92 working in the next release and the baby stepping in the near future. But please don’t mess up the UM3 firmware when retrofitting the S5 improvements.

Agreed. Your plugin is correct. The issue is on the firmware. I haven't retested the plugin on the UM3, as they are busy, but when I used it, it worked. So I presume the issue is only on the S5 firmware for now.

The code generated is attached. First move is 0,37 (0,27 first layer height + 0,1 z offset). so it's correct. But there is a G92 just after resetting the origin to 0.27. I believe this one is not properly interpreted by the firmware. UMS5_battery_en_long.gcode

Hi to all I have created a print job under Cura 3,6 using a Z Offset (with the plugin) to be printed on Ultimaker S5. The idea is to avoid squeeching the first layer on the build plate when printing with PETG and destroy the glass plate. I'm got the problem on UM3. There is a major improvement with the new bed leveling process on S5, but still first layer is a bit thin when hotend and build plate are hot. I set up the Offset to 0,1mm first. As a result, the first layer was printed in the air, 10 mm above the buildplate I then set up the offset to 0,01mm, same result I'm running the S5 with latest firmware : 5.1.7 I believe it's a bug in the firmware, not in Cura, as it worked before on UM3.d

I had some time this week and been able to re install everything not using any export. It works ! Either on UM3 or S5. The override issue on Cura Connect is only on the first material and on the S5. If you override the second material, the print starts without any issues.