I designed this vent redirector and extender because I was unhappy with the commercial options available for a long extender.

I had to divide it up into 6 sections. I was not happy with the results when I glued them together, likely due to uneven cooling and shrinking. So I designed a friction clip to slide them all together, which works pretty well, though it can be a little tricky with 6 pieces. The curved one was a bit of a challenge in Tinkercad and makes me want to learn something more powerful. There are still some gaps, but not enough to lose a significant amount of air. I designed it so the friction clips can be printed vertically without supports, though the thin contact area probably requires a brim, which I use by default.

With a large format build plate like the Monoprice MP-10 or Ender 5 pro, the redirector and extender could be printed all in one go, greatly simplifying the design an assembly, so I included those as well. I have not printed them, so I can't vouch for them. But for those with a normal size bed like myself, I have included the individual 5" parts.

My vent is 11" x 5". This could be reasonably easily modified to accommodate other sizes with a little work. I also needed a 10" extender, so I split that up into 5" sections.

Yes, I had to work in imperial units because that's what my tape measure had. This will be the last time I do that though, what a pain.

In retrospect, the extender could have been done with some printed clips and a commercial sheet of plastic, but when you have a 3D printer, everything looks like a nail. It's also 1/8" thick, which is likely overkill, but it works. I put some magnet tape on the bottom of the redirector, which raises it up a bit, but on carpet it all evens out. On wood, the redirector might have a slight gap depending on the thickness of the magnet tape.

It's important NOT to use PLA, as the furnace output can be warm enough to warp it. I used PETG, which is almost as easy to print as PLA. I thought the clear stuff looked cool with the gyroid infill. I imagine 100% infill would be clearer (especially if achieved by increasing the perimeters rather than infill), but slower and less material efficient.

Prusa

I3 MK3S

No

No

0.25 mm

15% Gyroid

I used PrusaSlicer v. 2.3.1 on a Prusa Mini+ (not available in the dropdown) Starting with the 0.25 mm draft settings, I made the following modifications:
15% gyroid infill
Brim
0 Elephant Foot Compensation

I noticed some bending and uneven shrinking on cooling, which is visible in the pictures of especially the left side of the redirector. The friction clips still fit quite well in my case, however.

The left and right redirector can be printed with the flat side down. The extenders need to be printed with the friction clips at the top, so a brim is likely important.

I designed this in Tinkercad using a combination of simple boxes and cylinders. The curved friction clip was the most challenging. The cylinder with different radii was critical, so thanks to TS232.