Printrbot Simple Metal Improved Fan Shroud

by EricY, published

Printrbot Simple Metal Improved Fan Shroud by EricY Jun 19, 2014
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Made this improved fan shroud for the Simple Metal with a snout that directs and concentrates air closer to the nozzle. Also gave it a longer and more organic shape to better minimize the back pressure. So far it seems to give more predictable prints.


Since it's longer, the fan needs to be mounted on the other side of the mounting holes and I made a spacer piece to account for the thickness of the sheet metal. It's separate so to avoid printing a bridge on the shroud piece.
You'll need 4x 20mm M3 screws to secure everything. My kit somehow came with those extras.

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Sorry if this is old news, but your shroud seems to be statistically advantageous http://www.desiquintans.com/coolingtests2

I've made three of these things, and while they all came out absolutely perfect, over time the heat seems to cause this fan shroud to sag downward and hit prints.Eventually I grind off the bottom because it gets so bad. (printed mine in PLA)
Any chance of getting a slightly higher version? Like 2-3mm?

It should be noted. The duct is fairly long, the fan MUST be relocated from under the bracket to ontop of the bracket with the shroud mounted on the bottom side of the aluminum fan mount.

Otherwise the fan is too long and impacts the bed.
On mine I had to cut the cable tie under the extruder motor to move the fan.

Thanks, my 2nd print, after printing feet for the printrbot! Same here as happened with Snowbound, the tip aims a little high. I will try to carefully bend the plate...

Thanks it printed out great. I have the Simple Metal 1403 which has the extended fan plate with 4 screw holes, so the spacer wasn't required. The shroud aims a little high with mine because of the angle of the plate. It still works much better than the stock fan, but some day I may modify it slightly to the proper angle. I'll posted a picture.

This is probably a dumb question, but what is the dimple for in the side of the fan? It does not seem to be there to avoid other parts. Airflow reasons?

On my Printrbot Metal, the shroud nearly hits the metal base box when the head is in home position. I belive the "dimple" is so that the shroud has appropriate clearance from the base.

Any chance this will work on a Printrbot (simple) 1312 all wood printer?

Oh my gosh this is perfect doubled the print quality thanks so much for making it! ;)

I cannot get this to slice in the newest version of slic3r. After about 5 solid minutes of slic3r looking like it is doing nothing, I usually kill it. The file is 19mb which seems rather large. Anyone else having an issue like this? Does a file of this size just take forever to slice?

[edit] - I did get this to slice, just took more time than expected.

This wouldn't slice at all on Slic3r 0.9.9, but once I got around to upgrading, Slic3r 1.1.7 chewed on it for about three minutes with no complaint before spitting out some gcode.

Printed one out in ninjaflex, I have a 2014 revision simple metal pb and I found the first gcode one on the pb site sometimes contacts the casing of the machine when the Y home gets confused and it overtravels slightly, but no such issues with this one, plus its flexible and distorts away instead of being a incident.
On my machine they changed the fan mount to a plate with a hole design, so the spacer is not needed.

Very nice design. How is it working for you? Do you find it significantly reduces back pressure?

would it be possible to design another fan shroud with a second fan so it blows air from both sides. I would love to have a solution to attach a 2nd fan without changing the original design. Wondering if it could be designed without taking the Z sensor. I printed this improved one and it works much better but still have bending issues because the uneven air flow.

Glad to hear the shroud working well for you! Do you know if Printrboard support 2 fans or can it drive 2 fans using a Y cable?

yes. I thing if you use you use a Y cable it will work. You would have to adjust the fan speed so it dries each layer at a right speed. It will be a solution to have an even part. Wondering if you could do it. I imagine something that could go around the Z prone so it blows right at the nozzle but from the other side side. Greetings. sebastian

Slic3r reports not manifold. Do I need to adjust anything?

Not really... It slices just fine on Slic3r 1.0.1

Ah! Looks like I'm still on 0.9.9 (This is one of my first prints).
It still ended up printing alright from the gcode download, but I'll see how it does when I update Slic3r

Nuts, printed it but because it is a g-code file my y-axis is mirrored... so the little indent is on the wrong side. anyway you could put up the STL so I could mirror the Y. Or put up one with a mirrored Y.

Ha never thought of that...! Just uploaded the STL, see if this one works.

What use are you making of the proximity sensor seen in the photo?

The Printrbot firmware uses this for auto-leveling of the bed.