Temperature control in the N2(+) enclosure

Topics around mechanical design, controller and electronics. Mods & hacks welcome.
zemlin
Posts: 360
Joined: Sat Oct 21, 2017 2:02 pm

Temperature control in the N2(+) enclosure

Postby zemlin » Tue Feb 20, 2018 4:00 am

My next mod project is to add heating/cooling to the N2(+) printer enclosure. I'll keep this thread going as a running log of the project.
My printers live in the garage. It's attached to the house which tempers the thermal fluctuations, but between winter and summer the temperature in there can go from 40°F to 85°F (~5°C - 30°C). I've been monitoring the temperature inside my N2+ near the build platform and have seen temps a little above 40C even in cooler weather, so it's not going to take much to boost it up to 45° or 50°C. My bigger concern for now is as the temps in the garage go up in the summer, the inside of the enclosure could go much hotter if the ambient is up by 20°C or more.

My first printer, a Makergear M2, was not enclosed at all. When I moved it into the garage I knew I needed to build an enclosure for it. My experience with the evolution of that enclosure is a good basis for modding the Raise printers.

Here's the kit I have lined up. Not pictured is a 6" square of .03" stainless steel which will be a heat shield.
IMG_0847.jpg

There will be (5) 80mm fans involved. Two will be to keep the air inside circulating. One will blow on the 200W ceramic heater. The last two will be mounted in the lid and exhaust when cooling is required. Since the machines are in the garage, I'm not too concerned about noise added by the 5 fans, although these are pretty quiet. I used the same fans in my M2 enclosure.

The temperature controller is a $16 unit from Amazon that I've used with good success on my original enclosure. This will be mounted in the plastic panel right above the touch screen.

the small black blob next to the fan guards in the photo above is a light socket for the heater (the large black blob).

I'll be modding the N2 first because it's a lot easier to handle than the N2+. I'll be working on it when I have time. Once it is finished and proven I'll move the N2+ to the floor and spend a Saturday getting everything installed.

In addition to photos, I'll be making some tools and printing some parts. I'll post files for those here as well.

I have a Dremel with a router base. I'll use that with an 1/8" endmill and 3D printed templates to make the cutouts for the fans and controller.

That's all for now. Stay tuned.

jdonze
Posts: 1
Joined: Sun Apr 29, 2018 1:47 pm

Re: Temperature control in the N2(+) enclosure

Postby jdonze » Wed May 16, 2018 9:28 am

You or others might gain some inspiration on what I have done on my N2, very similar to what you are planning. I still have to find the time to post all the mods I have done though. As for the heating build chamber part:
I used a computer fan behind a 300W heating element I got from ebay:

0.jpg

0 (1).jpg


I printed an ABS bracket to hold everything together. Because I did not want to cut a hole in the enclosure, I printed a new panel with transparent PLA for the control unit. I did not add any cooling fans, that would require a pretty big hole in the enclosure from which the hot air can escape, even with the fans off.
With this setup it takes about 15 minutes for the enclosure to warm up to 60 degrees C. 70C is really the max temperature I can get the enclosure, the heating element is then on continuously. The enclosure is not nearly airtight and poorly isolated, when I turn the heating element off I see a temperature drop from 60 to 50 degrees in just one or two minutes. To keep the temperature consistent there is no need for cooling fans extracting the hot air out of the chamber. I usually see a deviation of 2-3 degrees above and below the setpoint.

With temperatures above 65C a layer shift would sometimes occur on longer prints. I have added an airduct on the side to give the drivers more cold air and that seemed to fix the issue.

zemlin
Posts: 360
Joined: Sat Oct 21, 2017 2:02 pm

Re: Temperature control in the N2(+) enclosure

Postby zemlin » Thu May 17, 2018 2:03 pm

Looks good. I have printed a lot of the parts I need, but haven't had time to execute yet. I have a heat-trap concept I use for external holes where the inlet and outlet are both below the hole. This means any hot air going into the duct remains in the high spot and limits any convection through the duct - basically the same as a trap in a sink, but upside down so hot-air won't pass through freely.

zemlin
Posts: 360
Joined: Sat Oct 21, 2017 2:02 pm

Re: Temperature control in the N2(+) enclosure

Postby zemlin » Sun Jul 22, 2018 1:14 am

I finally got some time to do some of the work on this. Tonight I installed the exhaust fans in the top cover. These will be controlled by the temperature controller when it calls for cooling.
I made two fixtures for cutting the fan holes and opening.
The first is just a block with a hole pattern to match an 80mm fan.
I locate one hole and screw this block in place. I square it up and clamp it to the plastic so I can drill the other 3 holes.
IMG_1295.JPG

The second one mounts to the fan holes and it a guide for a dremel with a router base. I use a 1/8" endmill bit to cut the plastic.
IMG_1296.JPG

Here you can see the 4 fan holes after drilling with the first jig.
IMG_1301.JPG

Here the router guide is attached and ready to cut the fan opening.
IMG_1302.JPG

zemlin
Posts: 360
Joined: Sat Oct 21, 2017 2:02 pm

Re: Temperature control in the N2(+) enclosure

Postby zemlin » Sun Jul 22, 2018 1:16 am

IMG_1303.JPG


IMG_1304.JPG


IMG_1305.JPG


IMG_1307.JPG

zemlin
Posts: 360
Joined: Sat Oct 21, 2017 2:02 pm

Re: Temperature control in the N2(+) enclosure

Postby zemlin » Sun Jul 22, 2018 1:20 am

Here a fan is in place inside the top cover.
IMG_1308.JPG

Here is the "heat trap" I'll be mounting on the outside. This will limit convection through the cabinet because the hot air inside the cabinet needs to be forced down by the fan to exit the trap. If the fan isn't running, hot air will stay above the cooler outside air at the opening.
IMG_1298.JPG

IMG_1297.JPG

Assembled to the cover
IMG_1299.JPG

IMG_1300.JPG
Last edited by zemlin on Sun Jul 22, 2018 11:03 am, edited 1 time in total.

zemlin
Posts: 360
Joined: Sat Oct 21, 2017 2:02 pm

Re: Temperature control in the N2(+) enclosure

Postby zemlin » Sun Jul 22, 2018 1:22 am

IMG_1309.JPG

zemlin
Posts: 360
Joined: Sat Oct 21, 2017 2:02 pm

Re: Temperature control in the N2(+) enclosure

Postby zemlin » Sun Jul 22, 2018 1:59 am

Here are STL files for the fan hole fixture, the dremel guide for the 80mm fan hole, and the heat trap.
Attachments
8x10-drill-guide.stl
(554.28 KiB) Downloaded 4 times
stepper-dremel-guide-saddle.stl
(314.24 KiB) Downloaded 4 times
80mm-heat-trap.stl
(507.7 KiB) Downloaded 5 times

hardbc
Posts: 33
Joined: Tue May 17, 2016 1:44 pm

Re: Temperature control in the N2(+) enclosure

Postby hardbc » Sun Aug 12, 2018 4:16 pm

Hi!

Nice job, congrats!

Can you please tell me what have you used for cutting the plexiglass?

Thanks a lot!

zemlin
Posts: 360
Joined: Sat Oct 21, 2017 2:02 pm

Re: Temperature control in the N2(+) enclosure

Postby zemlin » Mon Aug 13, 2018 12:41 pm

hardbc wrote:Can you please tell me what have you used for cutting the plexiglass?

Thanks a lot!


I'm using a 2-flute 1/8" diameter endmill with an 1/8" shank to fit into the Dremel.

https://www.mcmaster.com/#8876a13/=1e4yl4i

hardbc
Posts: 33
Joined: Tue May 17, 2016 1:44 pm

Re: Temperature control in the N2(+) enclosure

Postby hardbc » Mon Aug 13, 2018 1:12 pm

Thanks, you also seem to have a router like end for Dremel, in that I was more interested. :)

zemlin
Posts: 360
Joined: Sat Oct 21, 2017 2:02 pm

Re: Temperature control in the N2(+) enclosure

Postby zemlin » Mon Aug 13, 2018 1:21 pm

https://www.homedepot.com/p/Dremel-Plun ... /100609334
It's not great, but it's good enough.


Return to “Hardware”

Who is online

Users browsing this forum: No registered users and 3 guests