Minor improvements to diamond hotend...

My RADDS-Delta is running on 24V, but the resistor in the diamond hotend is made for 12V.
It is shorter than the regular heater elements, too. ( 15mm instead of 20mm )

What are my options now?
Use PWM to reduce max power to the 12V heater? How do I do that in RepRapFirmware?
Use a common 20mm/24V heater which would stick out? How do I keep it from melting the effector / fanshroud?

Find a source for the right heater. Any reseller in Europe?

Thanks for reading
-Olaf

PS: I changed the subject to discuss further improvements. Still have to test it....

Edited 1 time(s). Last edit at 11/02/2016 10:48AM by o_lampe.

Quote
o_lampe
My RADDS-Delta is running on 24V, but the resistor in the diamond hotend is made for 12V.
It is shorter than the regular heater elements, too. ( 15mm instead of 20mm )

What are my options now?
Use PWM to reduce max power to the 12V heater? How do I do that in RepRapFirmware?
Use a common 20mm/24V heater which would stick out? How do I keep it from melting the effector / fanshroud?

Find a source for the right heater. Any reseller in Europe?

Thanks for reading
-Olaf

Olaf

Have a word with Ian (AKA Deckingman) on the Duet3D Forum Duet3D He is using a Diamond with 24V I believe (he has also modified it to use a PT100 sensor as well but that's another story)

HTH

Doug

I was hoping to find help in this forum, instead I got a tip to look elsewhere

Nevertheless, I decided to give my 24V/40W heater element a chance and insulated the brass nozzle with demake up cotton pads to avoid excessive heat radiation. Now I can use PLA-part cooling fans without a shroud.
I also sealed the tip of the nozzle with heat resistant silicon. Maybe I can avoid PETG sticking to it, like I have had before.

Edited 1 time(s). Last edit at 11/02/2016 10:43AM by o_lampe.

I thought I could feel ears were burning.........

I use a common 20mm long 24V cartridge. It does stick out 5mm above the brass but doesn't cause me any great problem. The lowermost fins of the heat sinks just touch the top of the cartridge but that's an advantage as it means the cartridge will never fall out. I had a spare kicking around so I've taken a couple of pics



They are a bit blurred but you'll get the idea.

If your mount is modelled on the standard diamond heat sink shroud design, then it just clears the heater. Mine is only printed in PLA and not had any problem with it melting.
HTH

Thanks for answering deckingman.
So we went the same route with the heater. Is yours 40W too?

What's the orange stuff, is it from cotton wool too?

Regarding the shroud/effector, I'm still not happy with the models I've found on thingiverse. ( Tried three designs by now )
You really have to measure all the relevant things, before you print....
None of the heatsink cutouts really fit in real life. Just add some extra clearance please
The worst one comes with 42.8mm distance between rod end mounts. How am I supposed to modify my carriers to match this?

Edited 1 time(s). Last edit at 11/03/2016 04:20AM by o_lampe.

Yes, mine is 40W too.

The orange stuff is 3 sheets of silicone cut from a baking tray that another user on theses forums kindly supplied. I did some back to back testing, comparing it against the standard 3 layers of "fire blanket" and the results indicate that it should be OK but I've yet to test it in real life.

Not had much of a problem with the shroud/mount but my machine isn't a Delta.
HTH

Has anyone made a flying extruder for the diamond on a delta? I'm unsure if I can use short and straight PTFE tubes or do they have to be curved?

Mine's coreXY not a Delta but I have a sort of flying arrangement. It's not pretty but because the extruders are suspended on a counter weight arrangement in the centre of the bed, it's taken a lot of the weight off of the axes and allowed me to use 250mm long Bowden tubes on a 400mm square bed fitted inside a 600mm square frame. If I'd put the extruders on the frame, the Bowden tubes would have been around 700mm long.









You get the idea.

With a fixed bed on a delta it is different, I also have to deal with ~300mm z-variation. Might worth a look in the flying extruder thread...