Duet development news

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aussiephil

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dougal1957
I Would Echo the concerns with the Titan I put one on My delta and struggled with it to get a decent print without jamming/Stripping.
Went back to the original Mendel Mini extruder and issues disappeared I think the issue came down to the Length of the Bowden Tube (Mine is 800 mm long).

I think as the pressure builds up and the friction of the tube is just to much for the Titan to cope with it seems to lay down the first few layers ok but then starts to skip and then strips the filament unless I slow the whole printer down ie down to something like 25mm/s print speeds It normally runs nearer to 120 (and is capable of faster).

I haven't yet experimented with shorter tube as I am at the minimum really that I can get away with (Printer is 1 mtr tall with 500 mm sides)

on Smaller Deltas with more modest Bowden setups it may be OK.

Doug

Apologies off topic-----

Time to do a flying extruder, at 200mm of tube, the only issues have been actually blockages caused by crappy filament at which point the Titan just eats the filament... I have found that the tension nut needs to be done up a fair way.. This is with PLA... be interesting when i switch to ABS, still waiting on PET tape to arrive from china...

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dc42

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deckingman
Should I be looking at anything special in the way of extruder stepper motors to take advantage of any of this? I'll shortly be ordering 3 off E3D titans (thanks for the idea DC42 although initially I thought they were too expensive) and I was just going add whatever steppers they (E3d) supply.

I should point out that I haven't tried the Titan yet. E3D hardware is generally well-designed; nevertheless you might want to see read some reviews before you commit to buying three of them. Regarding stepper motors, with about 3:1 gearing (same as the Titan) I find 34mm long motors with about 22Ncm torque adequate for driving 1.75mm PLA, although a little more torque won't do any harm.

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dougal1957
I Would Echo the concerns with the Titan I put one on My delta and struggled with it to get a decent print without jamming/Stripping.
Went back to the original Mendel Mini extruder and issues disappeared I think the issue came down to the Length of the Bowden Tube (Mine is 800 mm long).

I think as the pressure builds up and the friction of the tube is just to much for the Titan to cope with it seems to lay down the first few layers ok but then starts to skip and then strips the filament unless I slow the whole printer down ie down to something like 25mm/s print speeds It normally runs nearer to 120 (and is capable of faster).

I haven't yet experimented with shorter tube as I am at the minimum really that I can get away with (Printer is 1 mtr tall with 500 mm sides)

on Smaller Deltas with more modest Bowden setups it may be OK.

Doug

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deckingman
The question I asked was really about choosing extruder steppers to make use of the new Duet stepper drivers. I guess it doesn't matter.

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Fpex
My opinion of the titan might change, I just discovered mine are defected by birth ... looks like they need replacing. Waiting for e3d to confirm it or not.

Also I follow david advice. For the extruder I use a thinner motor with less torque.

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Fpex
The narrow hobb is a faulty one , this is what i just learnt.

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dougal1957

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Fpex
The narrow hobb is a faulty one , this is what i just learnt.

Thanks for that just emailed them a pic of my hob and a new one has already been shipped out to me.

Less than 1 hour start to finish so fairly impressed (If it fixes the issue?).

Doug

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Koko76
So with the gory details out in he open now, are you able to talk about to what extent higher step rates have been tested? I have a delta with 1.8 deg/step motors and 15t pullies, 106.666 steps/mm. Running at 24v. I'd like to get at least 64 micro steps if not 128, and I'd like to hit travel speeds of 200mm/sec. I know you run .9deg/step motors with 20t pullies Dave, how high have you pushed your microstepping?

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dc42

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Koko76
So with the gory details out in he open now, are you able to talk about to what extent higher step rates have been tested? I have a delta with 1.8 deg/step motors and 15t pullies, 106.666 steps/mm. Running at 24v. I'd like to get at least 64 micro steps if not 128, and I'd like to hit travel speeds of 200mm/sec. I know you run .9deg/step motors with 20t pullies Dave, how high have you pushed your microstepping?

My delta is currently in pieces while I wait for some crimp pins to arrive. So far I have only done prints on my delta at 16x microstepping with interpolation to 256x enabled - and it is much quieter than it was before. I have yet to optimise the speed of step generation for the Duet WiFi, but I was getting 300mm/sec travel speed with the Duet 0.8.5 so I would expect around 400mm/sec with the Duet WiFi because of the faster processor. I have 160 steps/mm. So with your ~107 steps/mm, I would expect that with x16 microstepping you would achieve 600mm/sec, with 32x you would get 300mm/sec, and with 64x you would get 150mm/sec. Those figures will increase when I optimise the step generation code, and increase even more when I implement dynamically varying microstepping. And of course you can enable interpolation to get most of the benefits of 256x microstepping.

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dc42
[reprap.org]

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dc42
The T, R, B, H and L parameters are irrelevant when using a thermocouple or PT100. It doesn't matter which way round you connect a PT100 because it s basically just a very accurate resistor with a known temperature coefficient. Assuming you have only one daughter board fitted, the X parameter for the first PT100 should be 200. For a thermocouple board it would be 100. See [reprap.org] for a little more - but of course it's much easier with the purpose-made daughter boards

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Treito
I got my test board today. It looks impressive, but unfortunately it may take 6 weeks until I am able to test it.
I took a short look at the provided SD-card. There was a readme how to enable Wifi, but how I enter the SSID and WPA2-key?
Sorry, if it was answered before,

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dougal1957
Re Titan Extruder

Pleased to report that the New Hobb/Drive Gear has fixed the issue and I am Now very happy with it.

Doug

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aussiephil

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dougal1957
Re Titan Extruder

Pleased to report that the New Hobb/Drive Gear has fixed the issue and I am Now very happy with it.

Doug

Any chance of grabbing the issues, I've searched but can't find any details and despite my Titan seeming to be fine I'd like to know what to look for
Cheers
Phil