Submitted 1 year ago by chrischryse@lemmy.world to 3dprinting@lemmy.world
https://lemmy.world/pictrs/image/ee01a2e0-e3e2-4120-aa82-cfe81e58fd01.jpeg
I have a Nevermore filter with 24v fans, would it be fine to connect them to the parts that I have circled on my Prusa MK4?
Or is that dangerous?
That side of the PSU power cables will be unfused- or at least, fused on the AC supply side of the PSU which will happily set low voltage wires in fire before popping.
Yes you can hook them there, but you MUST add an inline fuse of some form to the fan leads.
Would that still cause a fire?
Would I connect both positive and negative to it?
Also would it just be better for me to use one of these amazon.com/…/ref=ppx_yo_dt_b_asin_title_o00_s00?i… with a laptop charger?
You would connect both positive and negative of your fan to the PSU rail, but the positive side to the fan would need the inline fuse.
You can connect it without a fuse, it’s just risky and I discourage doing that.
Those connectors would work for a secondary supply if your laptop charger is 12 volts. Most laptops charge at voltages higher than that though (15 to 20v is typical range) so read the charger spec carefully.
A quick search for 2 channel 24v fan controller yealded the below link. Not saying this is ideal for your scenario but something similar will work and can be powered with a power brick. Doesn’t look like it comes with instructions though so I’m not sure what current it requires. The temperature sensor could work to make it turn on when the printer heats up as well.
Dangerhart@lemm.ee 1 year ago
You might be able to but you really shouldn’t. At the best you wouldn’t have control over fan speed. Find the wiring diagram for the board and use a fan header
Dangerhart@lemm.ee 1 year ago
Per help.prusa3d.com/…/xbuddy-and-loveboard-electroni… it looks like you dont have any fan headers, you might be able to repurpose the unused ambient sensor header but no clue sorry. You might try splicing off the part or hotend fan? If you really wanted to use the input you might need a voltage step down or something
chrischryse@lemmy.world 1 year ago
Idk what type of connector my printer uses since my fan is different
FuglyDuck@lemmy.world 1 year ago
Pi’s are usually 5vs, they won’t drive a 24v fan happily at all.
At that point what you can do is a power relay- like how most bed heaters work. That could be controlled by a pi, but delivers power from a 24v source.
Dangerhart@lemm.ee 1 year ago
Honestly if your going to go through all this effort to make this work, and already have a pi, I would suggest instead upgrade the control board and switch to klipper, there have to be guides out there
Dangerhart@lemm.ee 1 year ago
Powering the fan from gpio pins probably isn’t going to work out well either, they are 3.3v and 5v. Powering the fan from the PSU is going to be similar to powering a pi off it, I believe you should step the voltage down to what each needs, where the fan is 24v I think the pi is 5v. Your PSU is probably 115 or 220 v. For connectors I would expect to have to redo them yourself with micro fit, molex, jst or w/e you want and can get. On some of mine I just did single pin molex on the pins of the white female connector for fan headers, it doesn’t lock but it works if you don’t have a lot of movement. This page is awesome for connectors info mattmillman.com/…/common-jst-connector-types/
TwanHE@lemmy.world 1 year ago
Incase there’s no fan header left you can always get a variable buck converter with a rotary knob to manually set the speed on the fly atleast.