Solidoodle 40mm fan repair
by kj6epl, published
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I use an ABS cooling duct on my extruder, and after melting the first one, I found that it works fine as long as you continuously circulate a small amount of air. In my case, I "idle" the fan at a PWM value of 38 (M106 S38) during warm up and the first layer. After that, as long as it comes on for a few seconds each layer, it will be fine. Since the fan won't spin up at a duty cycle that low, I briefly give it full power to get it going, then idle it. Here's the first part of my startup script:
M190 S70 ;Wait for bed to heat up
M140 S80 ;Finish bed warm up while hot end is heating
M106 S255 ;Start fan
G4 P500 ;Pause 500 ms for fan to start
M106 S38 ;Idle fan
M109 S200 ;heat hot end and wait
If you use a heated bed temp >100C, you may need to start the fan before turning on the bed heater. Also, you may have to experimentally determine what "idle" pwm value works best for your setup; 38 is just what works for me.
Also, if you (or anyone else reading this) need a driver for your fan so you can use PWM control, see thing:22202 for a good driver circuit.
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2. Remove the damaged fan or move it to a workable position.
3. Option 1: Using pliers, gently wiggle the damaged fan blade while pulling backward until it comes off. (see picture)
3. Option 2: Puncture the label on the front of the fan with a push pin or small screwdriver, and push out damaged blade.
4. Pry out magnet using a small slotted screwdriver or pick. (see picture)
5. Remove bearing and axle with pliers. It will most likely break off; if it does, remove any remaining plastic fragments from the axle. (see picture)
6. Install magnet into new blade dark side up/silver side down by laying the blade on a hard surface and pressing it in. If you have an arbor press at your disposal, use it.
7. Re-drill axle hole using a 5/64" bit. Do not drill through the back of the blade. (see picture)
8. Install the axle/bearing assembly to the new blade. Make sure you press it in square. (see picture)
9. Grab the bearing with needle nose pliers and spin the blade. Adjust the axle until it doesn't wobble.
10. Install the finished blade into the fan. You're done!
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