Active chamber heating mod - User mods

RE: Active chamber heating mod

3d0zer — Fri, 05 Jun 2026 09:44:24 +0000

100%. I have XPS plate on the top now. Zero issues to warm up. Have put my SpacePi on top of it, it is heavy and pushes the rivets and screws of the top plate of my printer into the xps plate so no air can escape. Printer heats up now to 50 degrees celcius in no time. start printing there with ASA. Thinking to also insultate the side squares that are just a milimeter of steel plate. Cover it with some 3d printed cover and should save a load of energy and make it much faster. The front door needs to be seethrough though, but is also an option because of the inside camera.

The plate of XPS does not bother me. It is more functional in carrying the weight of the SpacePi than the support I printed from Printables. It made it sag, and the XPS has no problems carrying the SpacePi.

RE: Active chamber heating mod

Cédric — Thu, 04 Jun 2026 07:21:34 +0000

Posted by: @3d0zer
IMHO the big problem is the roof. I made some pics with a thermal camera, and the heat mostly escapes through the vents, which are even closed but still let a lot of heat escape.
It is like with a house, 60-70% of the heat escapes through the roof so there you will make insulation first.
I also can smell the asa fumes coming from the roof vent, because the fans are almost off to reach the 60 celcius.
Next step will be putting some insulation on the roof. It will for sure heat up much faster.
Keep you posted
ps. If you ask me, the insulation and thus energy efficiency of 3d printers is to cry about, like none existant.
Front door with hot point of the extruder

Roof with hot point under SpacePi X4 and the ventilation vent

Yeah you are correct, this has been known since it came out pretty much, hence its common to put a blanket on top or similar when printing higher temp materials, it makes quite a big difference. In my cold garage it has a blanket on most of the year, haven made a better top sheet yet, but i should. I agree its a bit strange that there is no effort kept on keeping the heat in, even a small effort would have made a big difference.

RE:

3d0zer — Wed, 03 Jun 2026 13:33:18 +0000

IMHO the big problem is the roof. I made some pics with a thermal camera, and the heat mostly escapes through the vents, which are even closed but still let a lot of heat escape.
It is like with a house, 60-70% of the heat escapes through the roof so there you will make insulation first.

I also can smell the asa fumes coming from the roof vent, because the fans are almost off to reach the 60 celcius.
Next step will be putting some insulation on the roof. It will for sure heat up much faster.
Keep you posted

ps. If you ask me, the insulation and thus energy efficiency of 3d printers is to cry about, like none existant.

Front door with hot point of the extruder

Roof with hot point under SpacePi X4 and the ventilation vent

RE: Active chamber heating mod

Rainer — Sun, 08 Mar 2026 09:46:39 +0000

One of my first ideas was to build the lid of the Core one with an integrated heater and simply replace it when necessary.
However, I rejected this idea again, even though the design was almost complete.
Firstly, because the air at the outlet is quite hot and I didn't want to expose the print head, belts and motors to this extra stress. Secondly, because of the thermals. Heat layers form, hot air rises and hot air comes back down from there.
For this reason, I also rejected the solution with an upper side window.
In terms of heat distribution, it is best to let the hot air rise from below.
In my solution, the air is sucked in at the top, heated, and the hot air flows out at the bottom and rises. A cycle is created and the layers of heat are mixed. The aim is to achieve as homogeneous a distribution as possible.
The housing fans are switched off and therefore do not create any draughts.
However, you need a control system for this.
I don't want to discourage you from your idea. But whether it's such a good idea to put a dryer in a heated room is certainly not what the manufacturer had in mind. What are the permitted operating temperatures of the dryer? Fire safety?
However, I see the biggest problem in the heat distribution.

RE: Active chamber heating mod

PrintsCharming — Sun, 08 Mar 2026 01:34:13 +0000

This is a picture of the core one lid moved up to the top of the Cube and the top of the core one open.

RE: Active chamber heating mod

PrintsCharming — Sun, 08 Mar 2026 00:44:20 +0000

Below is a picture of how its vented through the window. On top is something I designed using one of the Core One profile drawings, and pictured below that is the Sovol SH03 filament dryer that I use . It works very well and has 2 separate sides that each hold 2 spools of filament. Im working on a design to sit the Sovol inside the Cube enclosure I designed held up on a plate suspended from rods attached to the bracket designed to assemble the Cube as well as snap into the side frames to handle accessories. I planned to wrap it in plexiglass with the original top going onto the cube and the core one being open to the Cube to acommodate the addition of the INDX in the future. For the sovol I planned to design a printable replacement lid for one or both sides so that they have openings that can vent one or both sides heated air into the enclosure and the Core one below. Each side of the Sovol SH03 has a 200 watt heater capable of 85c and it reaches it pretty quickly. I am not recommending this as an active enclosure heater to maintain temperatures over the recommended 55-60c, but it could be used to quickly raise the chamber temperature, and maintain it under your control. There are a lot of possibilities. Each side works independently, so one side could be closed drying filament to your specifications, while the other side has a modified dome lid which vents the heat from that side into the enclosure and the temperature from that side is independent of the other side. I think it would definately work, but I need to find out if the entire Sovol being inside the enclosure and raised to say 60c is too much for its rating. I'm pretty sure I can fit the sovol, which can house 4 spools into the cube and have room for the INDX, and optimistic that I can also suspend another 4 spools and still have the clearance in the front for the INDX and all its added tubing management. We will see. What are your thoughts on housing the Sovol inside the cube as a topper to act as filament/tubing management/filament dryer, and chamber preheater temperature booster all in one?

RE: Active chamber heating mod

PrintsCharming — Sun, 08 Mar 2026 00:13:48 +0000

I have the vent flaps you just linked on my core one and piggybacked onto them i have a adapter meant to fit on the core one to a 4 inch duct which I ran through a cardboard box cut to fit my window with the grey foam that was wrapped around the Prusa in the box it came in. It vents the air to the outside when im printing ASA or the likes, and stays closed so air from the outside cant come back into the core one if wind is blowing straight into the duct.

RE: Active chamber heating mod

hyiger — Sat, 07 Mar 2026 23:53:02 +0000

The main problem is sometimes you need a colder plate but a warmer chamber which is impossible when the chamber is heated by the plate. I really wish Prusa would come out with an official chamber heater. Of course, they'll announce it, not offer it for sale until 6 months later then immediately sell out with a 6 month back order.

RE: Active chamber heating mod

Rainer — Sat, 07 Mar 2026 21:14:02 +0000

For some applications, a better temperature in the Core One chamber would be helpful.
Especially when the printer is located in a colder environment, it has difficulty reaching the theoretically possible 55 degrees. That's why I built a heater for the Core One. Not necessarily to achieve a higher temperature, but to reach 55 degrees faster and maintain it evenly.
I would not recommend more than 60 degrees.
I thought about it for a long time and considered various options before rejecting them.
There is simply not much space in the Core One, and I didn't want to make any fundamental changes to it, as it is designed that way and I am convinced of the concept itself.
In the end, I integrated it as a self-contained element in the left side panel. A 220V PTC element with an integrated fan and a control system whose sensor I attached next to the original one.
A print with Asa, which warped at all corners without heating, came out perfectly flat with heating.
I am satisfied with my solution.

RE: Active chamber heating mod

Mike Daneman — Mon, 02 Mar 2026 18:19:51 +0000

Actually, this one is a good 3D printed solution: Core ONE Vent Flaps

I think it's a good design that doesn't add significant load to the fan (better than the design linked above that relies on displacement of a large flap). It's probably a bit more robust than a plastic bag. Although no disrespsect to the plastic bag intended. :)