Place to show off PCB Effector assemblies
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I wonder what the tightening torque is right for the nut? M12 thread can withstand rather large torque even aluminium one (21Nm) but I doubt FR4 and moreover a plastic washer can. Does overtightening have any detrimental effect on the strain gauge which are just accordeon shaped traces on the effector PCB around the heatsink sitting hole? As for me thread lock is not good solution for the task considering a need for hotend reassembly and fragility of the PCB with all that electronic components on it.
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We've designed the effector so that that the strain gauge traces are clear of the area that takes the clamping force. You should be able to use quite a high torque, but bear in mind that the heatsink is aluminium and the thread pitch is fine - therefore the thread depth is small too. If you are in doubt then we suggest you use a drop of non-permanent thread lock.
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Thanks! First I'm going to try a medium torque something like 10Nm without thread lock. Getting it loose then thread lock will be last resort.
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DJ - would you mind sharing the mount for the fan holders you got there? I just ordered a set. PWM-wise gimme a quick rundown of how you've got them wired when you get a chance? I don't wanna blow anything up haha
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Hi dude, sure they're in the thingiverse listing for the fan shroud https://www.thingiverse.com/thing:2490021 screw the brackets onto the magnetic stud m3 bolts with m3 nuts, and then bond the fans on with CA/super glue.
If I was going to change anything I'd edit them to allow a little extra clearance between the bolt hole at the top and the vertical section so the nut is easier to do up, but being slightly tight keeps it tensioned so hey ho.
Wiring - you can run these fans on 12v (not 24v) but probably PWM them to 50% max. but that's up to you. I find they give plenty cooling at 5v.
If you prefer to do it properly, then you can take 5v from the duet board (see schematic - I think you can use the 5v pin on the fan voltage jumper or expansion connector) wire them in parallel at the smart effector, supply the 5v positive to them, ground them back through the duet Fan 0 (by default) GND pin which then allows PWM control.
I have a buck converter instead, as at the time I built the machine I was using 12v fans on a 24v system. If you go down this route then wire the positive input of the converter to the fan 0 positive (or I suppose any Vin source), wire the negative input to the converter to PSU negative, then send the positive output from the converter (set nominally to 5v output) to the fans via the smart effector, and ground them to the fan 0 GND pin, this allows PWM control.
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Just to say I have a supply of those tiny fans, if anyone UK based wants to buy one they're in my shop:
https://www.precisionpiezo.co.uk/shopProbably not worth sending them overseas as the shipping will be too much for just a fan on its own.
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Just a side note - I've been running those for a bit, you can also buy them 12V ones in the same form factor. The airflow is simply amazing.
https://www.digikey.com/product-detail/en/delta-electronics/BFB0312HA-A/603-1112-ND/1014443 -
Ahh good to know, now I need to find them in 24V and that would be perfect!
Can your confirm if the 12V ones work properly with PWM?
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Ahh good to know, now I need to find them in 24V and that would be perfect!
Can your confirm if the 12V ones work properly with PWM?
If you mean the 40x40 then I don't know the 30x30x10 fan I have - 5v one, will work at 12v but they do sound like they are working hard.
I just pull 5v off the duet 5v rail and ground it via the fan0 GND pin. -
Ahh good to know, now I need to find them in 24V and that would be perfect!
Can your confirm if the 12V ones work properly with PWM?
Yep, they do. I can run them from 25% to 100%
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For my part I used these blowers fan 24v 404010mm : https://www.aliexpress.com/item/2PCS-Gdstime-40mm-40x10mm-4CM-DC-24V-0-1A-Mini-Turbo-Blower-Cooling-Cooler-Fan-For/32799434002.html
10.25CFM, 24V works with PWM (without tuning M106, with default frequency F250)
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For my part I used these blowers fan 24v 404010mm : https://www.aliexpress.com/item/2PCS-Gdstime-40mm-40x10mm-4CM-DC-24V-0-1A-Mini-Turbo-Blower-Cooling-Cooler-Fan-For/32799434002.html
10.25CFM, 24V works with PWM (without tuning M106, with default frequency F250)
thanks for the link, I've just ordered a couple as for some reason the standard fan+shroud didn't fit my smart effector correctly. I just hope not to get burnt by Ali express again. The bed heater I ordered from there got lost in the post but they favoured the seller so I lost my money.
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I ordered two sets as well. I don't currently run 24V, but the time shipping takes, I might get the itch before they show up.
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Isn't it a lot more convenient to just run the fans from 12V? Sure, you need a step-down converter or a separate 12V PSU, but the choice of fans is so much greater. A DC-DC buck converter is below 10 money units on amazon.
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For my part I used these blowers fan 24v 404010mm : https://www.aliexpress.com/item/2PCS-Gdstime-40mm-40x10mm-4CM-DC-24V-0-1A-Mini-Turbo-Blower-Cooling-Cooler-Fan-For/32799434002.html
10.25CFM, 24V works with PWM (without tuning M106, with default frequency F250)
thanks for the link, I've just ordered a couple as for some reason the standard fan+shroud didn't fit my smart effector correctly. I just hope not to get burnt by Ali express again. The bed heater I ordered from there got lost in the post but they favoured the seller so I lost my money.
Np, hope you like them. I'll share my fan mount for the smart effector once I finish my duet wifi box
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This is my smart effector with fan duct based on David's design (its on thingiverse 2521716).
I have used my existing Traxxas rods with mounts that I put on thingiverse too (2492092). They seem to work very well - my best 8 parameter residual error is 0.005. As you can probably see, using Capricorn bowden tube, which seems excellent. Retraction of 2.4mm seems fine on the 60cm tube on my Kossel XL. Probe works wonderfully well. Not sure if my picture is going to appear though - haven't done this before. -
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Thank you (how did you do that?)
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Nice, what material did you use for the fan ducts ?
