rebekah_harper

Hiya all, I wanted to find out how I can hard wire a fan for power with a variable resistor. I am making a hood that is both part of an enclosure and extractor. I want to add a 77mm PC fan as part of the extractor element. Can I had wire this to the power supply output or is there another way of powering the fan? This is what I have made and I just need to power the fan and I can then put it on top of my printer. many thanks Rebekah Anderson

Have you tried a different model to see if it's doing the same? could you send a screen shot of what you see in layer view?

ahoeben, I think your right, when I saw your reply I remembered that I saw the number of bottom layers had increase by a massive amount. cheers for that 8) bex

this is my working solution https://www.youmagine.com/designs/pva-reel-casing

Hiya, this seems to be a common problem. here is my solution after I had this come out and yes the white spot in the middle is the hole i was trying to extrude through for 10mm of the core. so I made this. it's in the 3d prints section with a link. so far it has worked for me for 60 hours continuous printing. my printer never stop so to have to wait 2 hrs or so isn't a viable option. hope this helps bex

Hiya, the BB core has this issue due to the PVA and it's moisture hate relationship. with the moisture it starts to create a lining inside the core. this gets to a point where it's about 1mm diameter hole I uploaded a solution to the problem. a spool casing that holds silica gel packets and it can be put into a bag. what they missed is that if you print as much as we do, there is no opertunity to change the spool over with another PVA whilst you dry out the used one and print with the new one and do that for nearly every print. this isn't really practical. so for the UM 3, it's not an industrial standard with PVA printing. they should have considered encasing the PVA spool within the printer frame with either a heat element or silica gel pocket to place the packets in. I can imagine that either a UM3+ or UM4 will incorporate some controlled environment for the PVA spool otherwise on it's own it fails as a heavy user printer with PVA in mind. Sorry ultimaker but unless I missed something I believe this to be the biggest flaw. having said this I still love mine to bits. Bex

hiya, I do exactly what Geert_2 is suggesting. any part that needs exact fitting I reduce by half the nozzle size. works fine for me Bex

hiya, In cura, do you see the the layers? I am just wondering if the model lacks mass and is only a mesh. you might have to put the file through makeprintable website. it's a great tool to sort out some of the issues the models my have

hiya, I don't often do but I normally use line or zig zag for the pattern. If my layer height is 0.1mm then I set the infill layer hight to 0.2mm. I also make sure that the line width isn't too far off the nozzle width for infill. and lastly I have about 3 line wall width. hope this is helpfull. bex

Hiya, as my printer is printing I can't check but on my UM2+ I know I can create custom material profiles. however I have found that the CURA material profiles do override the printer material profile. I get a warning when I send the file over wifi. so I believe that via USB it will do the same.

I have had major issues with PVA. problem is once it starts being an issue it builds up inside the core. I have cleared it once and found that about 10mm of the core from the nozzle up had build up. the hole ended up being about 1mm wide for that 10mm. I think that mosture may be the cause because I tried everything and nothing. I have uploaded my solution to Youmagine and in the 3d prints section. it's a casing for the spool, it's simple and so far it's been working fine. I did have to replace the core though as it had failed. this is where the ultimaker fails when you print continuously and can't change the PVA spool as it's in constant use. it remains exposed and absorbs moisture. I put the spool inside my UM2+ with the build plate temp at about 50-60 deg overnight to dry it out, then placed it in my cunning idea and so far so good. top tip forultimaker is to either extend the rear in oreder to encase the PVA with either pockets for silica gel or a low heat source. hope this helps Bex

hiya, I wouldn't mind to understand this subject. Being able to re-write these with data of a material that isn't ultimaker's like Ninja flex or if you prefer another brand of material or simply because you want to use a colour that UM can't supply. transfer the filament over to a UM spool and reset the data on the spool. something like that anyways bex

I have not seen a material profile that goes that high in temperature. in other printers I have found this to be a common cause of blockage. it's heat creep where the heat travels up the material faster than it can cool and the material softens and compresses, this causes it to expand as it can't go anywhere else especially when printing fine as your extrusion rate will be slow. this expansion then causes it to get wedged. you might have to do a hot and cold pull to make sure its cleared out. hope this helps PLA as a standard should max out at 210 but normal printing is at 195 to 200.

UGH, that's 12 days away. burning questions already lol I will have to set a reminder

Hiya all, I was wondering if there was any way to create a printcore with user defined nozzle size. It seems that when slicing it initially with the printcore size then uses the extrusion width to calculate the paths. this means that if I use 0.25 or smaller I lose details. so I need core profiles that I can edit to suit the nozzle size I am using. cheers Becky

Thanks for the info. I think S3D got a bit too comfortable. Cura made a massive leap forward and I think that in part thanks to you ???? I'm only using S3D cause I'm having an extrusion problem with the PVA. It's not consistent. There are breaks in the lines it puts down. It does eventually start to work as it suppose to but just not after the first layer. I think it might be a temp thing as I have cleaned out the nozzle so many times. It's getting boring. I just completed a 7hr print with S3D using PVA support and it looks great. So it leads me to think it's a profile issue with Cura. I might set the PVA to default 220. Again thank you and I will amend the script as suggested. ????

Many thanks. I have tried it and yep spot on. it now does what I want it to do but found that it didn't wait for the temperature to stabilise before it printed. so I added a M109 command with a {if new tool} entry infront of it and now it does what I want it to do. change tool using idle temps and wait for it to heat up. winner. would I need to add retraction settings in there or will it go by the start script of the GCode file?

Hiya all, I am trying to use S3D with UM3 as Cura 2.7 is causing me issues with PVA support material not being printed properly. I have cleared BB core from any blockages. below its the tool change script: M218 T1 X0.0 Y0.0 ; reset extruder offset T[new_tool] M218 T1 X-18.0 Y0.0 ; set extruder offset ; uncomment section below to use idle temperatures {IF NEWTOOL=0};M104 S100 T1 ; idle right extruder {IF NEWTOOL=0};M104 S[extruder0_temperature] T0 ; heat left extruder {IF NEWTOOL=1};M104 S100 T0 ; idle left extruder {IF NEWTOOL=1};M104 S[extruder1_temperature] T1 ; heat right extruder S3D doesn't seem to actually use the idle temps. and I am wondering if the above is the issue. It states '; uncomment section below to use idle temperatures'. I don't know if this obstructs the command. I have checked the Gcode file and this is what I have. G1 X144.076 Y142.000 E3.8715 G1 X144.076 Y141.715 E3.8733 G1 X144.076 Y141.600 F1800 G1 X143.191 Y141.600 F1800 G92 E0 G1 E-12.0000 F900 G1 Z0.400 F1500 M218 T1 X0.0 Y0.0 ; reset extruder offset T1 M218 T1 X-18.0 Y0.0 ; set extruder offset ; uncomment section below to use idle temperatures ;M104 S100 T0 ; idle left extruder ;M104 S195 T1 ; heat right extruder ; prime pillar G1 X148.312 Y164.098 F15000 G1 Z0.200 F1500 G1 E0.8000 F900 G92 E0 G1 X159.912 Y164.098 E0.0727 F1620 G1 X159.912 Y175.698 E0.1455 G1 X148.312 Y175.698 E0.2182 G1 X148.312 Y165.098 E0.2847 G1 X148.312 Y164.098 F1620 G92 E0 G1 E-6.2500 F1500 The statement appears again but if i delete the section below in the tool change script as described and this is what I got: G1 X144.076 Y142.000 E3.8715 G1 X144.076 Y141.715 E3.8733 G1 X144.076 Y141.600 F1800 G1 X143.191 Y141.600 F1800 G92 E0 G1 E-12.0000 F900 G1 Z0.400 F1500 M218 T1 X0.0 Y0.0 ; reset extruder offset T1 M218 T1 X-18.0 Y0.0 ; set extruder offset ; prime pillar G1 X148.312 Y164.098 F15000 G1 Z0.200 F1500 G1 E0.8000 F900 G92 E0 G1 X159.912 Y164.098 E0.0727 F1620 G1 X159.912 Y175.698 E0.1455 G1 X148.312 Y175.698 E0.2182 G1 X148.312 Y165.098 E0.2847 G1 X148.312 Y164.098 F1620 G92 E0 G1 E-6.2500 F1500 G1 Z0.400 F1500 G1 X159.686 Y164.158 F15000 G1 Z0.200 F1500 G1 E0.0000 F1500 G92 E0 G1 X159.852 Y164.324 E0.0015 F1620 G1 X159.852 Y164.889 E0.0050 G1 X159.120 Y164.158 E0.0115 G1 X158.554 Y164.158 E0.0151 G1 X159.852 Y165.455 E0.0266 As you can see the statement is gone and so has any refference to the temperature. either it's suggesting that the UM3 internally understands there is a tool change and uses the idle temperatures or it just doesn't do it, which in practice would be no different. any one understand what I am trying to convey and what I should do to ensure the idle temps are used. many thanks becky

Anytime. good luck with the print

This is why I had to take mine apart. you can see it doesn't poke out the bottom of the top plastic part.

Yeah I litterally paused my print to open up my head to check I was right as I only stripped it the once. and it sits on top of the main frame. for sure. plus in the photo it's hanging too low. it's only a short guide to keep the spring in place. let us know if it works out.

the enclosure will improve it a bit as I am sure you are aware that the cooling of ABS during printing causes all sorts of horrible results. as it's rate of shrinking during cooling can affect the quality. so yes, you can get better than what you have originally printed but I have not had as good a quality as you have managed with the Zortrax. Having said that I haven't used Cura 2.7 in the 2+ yet with ABS. and I have had better results with PLA since the update. so it might have improved. I normally use S3D but with Cura they have made some incredible advances in functionality. I'd get that enclosure sorted, pre-heat the chamber then initiate the print. I also have the bed at 108. hope this helps and I look forward to your results

are you printing over USB?

Hiya, I use 3d solex print cores and that's set up with 0.15mm nozzle. I don't have a problem. i had to test out the right nozzle extrusion settings but it didn't take long. It will give a warning about some the core not being the right one as your profile is looking for a 0.4mm nozzle but ignore it and continue. just make sure that the line widths correspond to the nozzle size.