Thanks for the information dc42. I had a quick hunt on the duet wiki but missed/couldn't find the bit on temperatures. I will look at setting up the MCU temp sensor though regardless. Thanks digital_dentist for the suggestion of PIR. I hadn't realised this had flame retardant properties. The metal skin could help with noise suppression too!by WesBrooks - Slic3r
Cheers, that's another option. I was considering a big cardboard box! Think the lab being cold yesterday really wasn't a help. Temp limit for the duets? If I build an enclosure I'll be moving the duet to the outside.by WesBrooks - Slic3r
Hello, Have I missed where we talk about these on this forum? I'd like to see peoples feedback following making one, typical build materials, temperature setpoint, and temperature control performance. I've been asked to process some large chunky parts that may take a few overnight pauses or unattended building. With that in mind in interested in the safety aspects too. My system is the 300mm cby WesBrooks - General
Argh. Was hoping to get a bit closer without an enclosure! My first thoughts would be to a closed box sitting over the machine to part way down the sides with a fan to such out air from the he highest point if it gets too toasty. Like yoi say the heated bed should be plenty to get things warming up.by WesBrooks - Slic3r
This is what I was looking to do:by WesBrooks - Slic3r
Interesting. I will think about it more. The part I'm building is a large benchmark part. About 100*120mm ABS. It's almost a worse case for part curl (or at least would be in a sintering environment, I'm assuming the same for extrusion) due to the large flat area. Layer to layer time is in the order of minutes so doubt scanning an extra part would make much difference? I'm slowly stepping up thby WesBrooks - Slic3r
I'm going to create a second STL file that comprises of parts slightly offset from the main part with the intention of stopping sharp corners on my part cooling too much and curling free. How do I force the order at which Slic3r processes the parts? Is it simply first part processes first or does it tend to do perimeters then hatch etc? I'll be experimenting and update this thread if I find my aby WesBrooks - Slic3r
The recommended fuse levels for PSUs tend to be above the expected draw. Probably a safety margin for inrush or tolerable faults. Adding up the recommended fuse level on each PSU will probably be overkill. The start up of my 24V PSUs is naturally staggered as one will only power up after M80, which closes a relay that cuts the mains supply to the stepper/heater PSU.by WesBrooks - Safety & Best Practices
Best practice is to fuse at 80% of the max cable rating. Make sure fuse level is above the maximum expected loading with a margin. There is a chance of a nuisance trip if the fuse is too close to expected load. If you decide to have more than one fuse in a line (eg to enable the use of smaller csa wire for a run with lower draw) then to ensure propper fuse discrimination the maximum rating of a bby WesBrooks - Safety & Best Practices
It's alive! Minor wiring change as the force guided contact relay didn't change when using the normally closed contacts to power the reset button. Shame as it would have been a good self diagnostic. As it happened the relay just buzzed. I guess a small capacitor between the supply side of the reset button and the relay may just do the trick. Anyway, the core x-y system is running. Done a orthogaby WesBrooks - Ormerod
I'll be there early doors tomorrow - only visiting. Will drop by the Duet3D stand at least to say thanks for help on a couple of projects!by WesBrooks - General
Quoteandornot I sell 468MP sheets if require any on my website. Cheers for that. Cheaper than I had found on ebay. Things are often ordered through a third party for one-offs like this. Hopefully you will get that order this, or early next week.by WesBrooks - General
Quotejmrobert48Actually, the steps/mm, acceleration, jerk as well as other values can be changed in the g-code. After the printer behaviour is characterized, the changes can be made on a print by print basis, if needed/wanted. I was thinking of trying to run the M commands that specify the jerk and accelerations in the build file to see if they were changed outside of the part where the system Iby WesBrooks - General
Jerk is the derivative of acceleration in maths but not in the reprap firmware. In reprap firmware it is an instantaneous speed change that can be tolerated by the system. In other words the highest step rate that can be started in a jump from zero and the stepper motor looses no steps. I'm trying to understand the exact application myself but I understand it is used to reduce the need to accelerby WesBrooks - General
150mm/s is often cited as a recommended maximum feed rate (9000mm/min) for some systems. Mostly reserved for non extrusion moves. Based on my current settings start-peak-stop is achievable in vectors of 27.8mm and longer. The maximum angle change would be much smaller than 14° were this speed could be maintained - more like 5.7°. Still, significant scope for speed up on gentle contours and hatchiby WesBrooks - General
In relation to my original question you can see that where ever there is a vector longer than 4.6mm there is an opportunity to increase the maximum feedrate beyond the specified perimeter speed in order to raise the average traverse speed over the contour to the specified feed rate, so long as the limits of any of the axis are not exceeded in the move. This should not happen if the firmware/confby WesBrooks - General
My settings at the moment are: Jerk: 15mm/s Acceleration: 800mm/s Perimeter: 60mm/s Slow down on external perimeter: 0.7 These have not been tested in a build yet and are likely to cause artefacts on the surface of the model as the machine does shake a bit at those settings. Smallest vector on which the machine could reach the perimeter speed and stop again based on those numbers would be 4.6mby WesBrooks - General
Good point, my experience comes from the Duet 0.6 onwards and I only recently came across a tuning guide for one of the other boards where the settings were locked at compile stage of the firmware. You certainly have to be far more determined to optimise your system if each installation is a recompile and firmware flash rather than text file edit over a web interface and restart!by WesBrooks - General
Thanks, that's a second on my original interpretation of what goes on. That said, since it's the jerk and acceleration that cause machine issues I can't see my alternative causing issues. The max speed in the config file should protect the system from running at speeds the stepper drive system can't sustain. I'm interested to see a brake down of total time spent accelerating, at the feed rate, eby WesBrooks - General
I'm working on a python based model of the process in order to get a better understanding of it and a break down of where time is spent in the build process.by WesBrooks - General
Hi all, Is the set feedrate specified in the G1 code the maximum speed the deposition nozzle will reach along a vector, or do any of the firmware packages purposly exceed this value in order for the average feed rate to equal the specified feed rate up until it hits the maximum speeds set in the config file? Thanks!by WesBrooks - General
;-) Alas not on mine. Thanks for the tape name. Easy enough to get and much simpler to apply than the silicone sealant like approach that I thought it may have been.by WesBrooks - General
Hi, I've some Aluminium on order and need to bond my heated mat to it. Where do you normally source you cork matting for insulation? I may substitute the cork for silicone matting as we've some available. While it appears to have about three times the conductivity of cork the conductivity is still hundreds of times smaller than plain aluminium. Also what do you use to stick it all together? Plaiby WesBrooks - General
By the book, but 300mm x 300mm. This machine is supposed to be an early demonstration of an expandable format as far as build volume is concerned. This came about because some people at HQ (different site, different country) are interested in the technology at work, and despite often saying it's not ideal for their intended application they still want to have a go to see what it's like. I took aby WesBrooks - CoreXY Machines
Making light of a serious on line identity issue: XKCD Password Reuse XKCD Password Strength ...and just to show how awkward the password generation debate is: Is the XKCD Scheme no Longer Good Advice?by WesBrooks - Administration, Announcements, Policy
I did say similar! No need to state the obvious regarding passwords here. A well designed site will not store passwords in clear text. Yes, the encryption is fallible, but not as vulnerable as shouting out your pin code as you type it in at the cash point! We're all likely to have passwords for at least one bank account, multiple social sites, forums, and business log ons. Unless you are randomisby WesBrooks - Administration, Announcements, Policy
Hi All, I'm sure I posted something along these lines on here before but I can't find the thread - so may be I didn't! :-D The lack of https protection for the log in and general site usage seems to be making the users of this forum vulnerable. I'm not a website expert, but assume there is reason behind firefox warning me that logins to this site are not secure. My understanding is the passwordby WesBrooks - Administration, Announcements, Policy
Point well made! I'm learning as I go here. Ringing being the wobble after a direction change of the head creating visible artefacts/wobble on the outer walls? My current tactic was to find the missed steps level and drop 10-20% to create a safety margin before running live trials after everything has arrived. I'm not running polymer at the moment just running dry stress tests. Once building Iby WesBrooks - CoreXY Machines
These are the settings I've got in at the moment. I'm running a no heat test run with honeycomb core fill and it seems to be fine. I would like to push this to find the limits at some point but thing the lack of diagonal bracing on the frame will quickly result in a shaky thing! M566 X900 Y900 Z30 E300 ; Set maximum instantaneous speed changes (mm/min) M203 X9000 Y9000 Z600 E3000 ; Set mby WesBrooks - CoreXY Machines
Hello, I'm wondering what settings people are using so I know roughly what ball park figures to aim for/start from on the axis tuning. My setup is: Duet 0.6 Stepper Motors from Ormerod 2 - JK42HS34-1334A 24V stepper drive voltage E3D Titan Extruder E3D V6 hot end Z-axis is two steppers wired in series. Thanks.by WesBrooks - CoreXY Machines