Printrbot LC part cooling fan mount

by SometimesCake, published

Printrbot LC part cooling fan mount by SometimesCake Jun 8, 2012
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Printrbot LC part cooling fan mount by SometimesCake is licensed under the GNU - GPL license.

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After doing a lot of reading and a bit of testing this fan mount was the best solution I have yet found for the Printrbot LC.

I tried the http://www.thingiverse.com/thing:21462 fan mount, but it acted as a shim to raise the extruder. I had to compensate my lowering the z axis so low that it hit the hold downs for the glass. I ended up losing almost 3 inches on the Y axis. No good. I tested the part to see how it did at cooling. It cooled really well, but noted that I lost almost 15 deg C on the heated platform. :-/ Not wanting to find another solution for my heated platform I kept looking.

Then I found http://www.thingiverse.com/thing:15899. So I tested placing the fan on the side where it would still move up and down with the extruder. The headed platform only lost 3deg C and the parts printed really well.

This part completely replaces the wood one the Printrbot came with. I did this so I could use the same screws. The hardware store near my house doesn't carry 6-32x1 3/4 screws. 2 inch would hit the drive belt.

I've attached an image of two gears I printed. Both at .2mm layer height. The gear on the left is with the fan on and the gear on the right is with the fan off.


Just print it out, I used .4 fill with Slic3r. It matters how you install the part. One direction will place the fan too close to the extruder carrier and will stop it prematurly. I have pictures of it as I did this first. Then I realized the part could be flipped and the carrier had the needed clearance. This is for a 40mm fan. I got mine from some spare parts I took off the chip set of a discarded computer.

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I made a derivative, i'd like to hear what you think!

I posted a comment on your page :)

I'm looking forward to seeing some test prints. I'm interested to see how it works on a larger printing surface.

Try printing a single spare extruder gear as I did. I found it to be a good test for the fan.

Any chance you could make one of these that fits the LC-PLUS printrbot X carriage?


I don't have the measurements for the plus :-/ also with the added size of the plus I'm not sure this design would be as effective. I've had issues with extruder mounted fans over cooling, but that may be your best option with the plus.

How did you wire up the fan? Is there a connection on the circuit board or did you just wire directly to 12V?

There is a connection on the circut board labeled fan. Once connected to this, Slic3r can then turn the fan on and off for you. :)

Do you know if the fan connector on the board is 12V or 5V?

I know there was a long discussion about this on http://www.printrbottalk.comwww.printrbottalk.com. For me I just plugged in a fan I got off a computer chip set. It worked, so I just got to printing.

Where did you get your bed clips? I need exactly those so that I won't have to drill out new holes. And what did you use for the back of the bed - glass to hold it down?

I used these standoffs. http://www.thingiverse.com/thing:23387http://www.thingiverse.com/thi.... I used the same standoffs in the back as he front. I think I used the 1p3by2.

I had to drill two holes in the back. I just used some leftover 6/32 screws and some nuts to secure the standoff..

Printrbot standoff and glass clamp
by eddiema

Just completed mine. I had to trim the corner of my extruder mount to gain back my full travel. You can see this in the top left corner of my picture.

Some 40mm fans dont have large enough holes for a 6/32 screw so I used my remaining M3 x 18mm screws and 2 nuts

I really want to print this, it looks really good, but maybe i'm missing something but there's no download?

Back up. I just didn't want to waste your plastic on a part I wasn't proud of. :-/ This one is working great for me.

Awesome thanks i'm about to start the print.

Sorry I took it down because I'm reworking the design. Version 1 worked brilliantly but the mounts were a little brittle. V2 was solid but didn't cool as well. I just built v3. I'm testing it now, if it works, the design will be posted in the next hour or so.

My extruder is hitting the fan with this mount :/

I just noticed that too on the last 1/8 of on inch. I switched this to a work in progress. I'm planning on lowering the mount a 1/4 inch to get it out of the way and thickening the screw points as one of mine cracked when I was careless and I smacked it.

Nice !!
lt;- two thumbs up.

Your comparison photo is telling; obviouslt the PrintrbotHQ printed gears did not have a fan.

Thanks, the first thing I did after getting my bot dialed in was print off a spare set of parts. :)