johnse

In preview I switched to displaying “line type”. It’s much more informative.

It’s easier to use a tool like pronterface in the Printrun package. This gives you direct control to extrude a specific distance or move axes manually without writing gcode. it also gives you a terminal where you can directly enter google and see the response.

My breakaway also tends to have a lot of little curly pieces. I think what makes it a good breakaway is that it doesn’t bond well...but that means it also doesn’t build great structures. Sometimes the support overlaps the part and those strands get commingled into the part... I’ve found that wider supports seem to work more cleanly, such as when supporting a wide shelf. Those tall, thin supports tend to break off partway through the print. if you search cur settings for “expansion” you’ll find support horizontal expansion that defaults to 2mm. You might try increasing that and possibly increasing support infill percentage. i had a small part with a short overhang I was printing in nylon. Cura didn’t put enough support there so I modeled a support block and did it as a 2-color print where the 2nd color was breakaway.

For sending arbitrary gcode, pronterface is a good choice: https://github.com/kliment/Printrun

You could use the technique often used for temperature towers. Select the menu Extensions->Post Processing->Modify G-Code. Press the "Add a script" button and select ChangeAtZ. In there you can select a height (either mm or layer number) and select something to modify. You can add the script multiple times.

I don’t have an S5, but it looks like it uses the same nozzle lift switch as the UM3. The reason your nozzles are at different heights is so only the nozzle printing is at the part layer level at a time and the other is reading above the part. The left nozzle, #1, is fixed in height. The right nozzle moves up and down by means of the “lift switch” on the right side of the print head. You can move this manually to see how it works. normally the printer moves the switch by inserting it into a white bracket on the right side at the top of the machine. If it’s missing the gap it won’t switch. it sounds like you need to do the lift switch calibration. I had the opposite problem with the switch rubbing noisily leading to some tips in this thread

Thank you. That gives me some directions to attack these antennae.

I ran the calibration and made sure not to push it too far to the right. Problem solved. Thank you.

I'm not talking about the bridging. I'm talking about all of the little spikes protruding from the vertical parts. Here are some closeups with the areas circled. I noted in the tags, but didn't mention in the text that this is being printed on an Ultimaker 3. And I get this whether I'm using support material or not.

I'm still fairly new to this but I've started printing with Nylon for some pieces. I'm using Ultimaker Nylon (natural) using the default profile--typically at .1mm, sometimes at .15mm layers (AA 0.4 printcore). I get a lot of thick strings/nubs on the parts whether I'm printing with or without support material and whether using PVA or Breakaway support. I also notice occasionally a brown color to the nylon--often on the prime blob. I thought I might be printing too hot, though the standard template for .1mm layers uses 245C. Last night I printed a temperature tower running from 255 - 220 in 5 degree steps. 255-240 printed successfully--but with lots of the thick strings. 235 started to print but broke off midway through the layer and then it was just a cloud of filament-on-air... So definitely cannot print below 240 degrees :) The top of the anvil is where the 235 section broke off. I'm not worried about that. It's all of the thick strings throughout the tower. It's a little hard to read the temps, but they are 240, 245, 250, and 255 top-to-bottom. Also notice in the overhangs you can see some of the brown discoloration at several levels. These nubs have to be cut off which is a pain especially on some threaded parts. They also often get embedded in support material and vice versa. Breakaway tends to like making little curly cues that break off or get embedded in the part material. Do I need to play with retraction? More/less cooling? I keep my filament in a dry box except when printing (planning to make a print-from-dry-box setup) but as you can see from the brim, the filament goes down nice and clear. I saw some other posts talking about oozing between material changes, but I get the same issues whether I use a prime tower or not, and of course the temperature tower was printed by itself with no support.

It does not squeak when pushed manually. However, I've noticed a white scratch forming on the part that connects the gantry rod to the belt. It seems the switch is scraping against that part. I'll try running the calibration.

Just wanting to report a minor bug. I have found that if I turn my UM3 off while Cura is running, then turn the UM3 back on, Cura will never find it online again unless I exit Cura and restart.

I had an issue with an Ultimaker 3 using MatterHackers' PLA being printed along with Breakaway build support. The MatterHackers' spool is slightly too wide for to use the guide arm for the Material 1 spool. I notice @nano-l's picture of the spools also does not have the guide arm in place. I got part-way through a long print and it began seriously under-extruding. I found that the filament from spool 1 had jumped the spools and was getting pinched in between coils of the filament in spool2. These spools counter-rotate and it was causing underextrusion of both materials. Another time, I was using Ultimaker's ToughPLA, and somehow it got a loop around the guide arm. Again, destroyed a long print. At that time I thought it was a clogged nozzle. Cleaned the nozzle and restarted the print but again was having the underextrusion. That's when I noticed the wrap around the guide arm. I haven't set it up yet, but I'm planning to create a spool holder to hold MatterHacker spools to the side so they can't interfere between the spools.

I have a problem I've not seen discussed. Every time the printer completes a layer with PrintCore 2 and raises it, it makes this loud squeaking/squawking sound--almost sounds like an evil laugh. I'm attaching a short video of this. I had noticed something similar after a while of printing PVA support with a BB core. Then I started using Breakaway with an AA core and the sound went away for a while. Now it's back. In neither case did there seem to be any problem with the prints. The lubrication guidelines only talk about oiling the metal parts. Is there lubrication needed on this switch? or is the sound coming from something more internal to the print head? I've shared the video on OneDrive