Just finished rebuilding my SD3 for the 2nd time

Nice print!

Looks like you fixed that printer up nicely.

also were did you find the compact part cooling fan duct?

It's a 1/4" MIC6 bed I believe I got from McMaster or similiar, and I countersunk the screws to be level-ish with the bed surface.  The thicker the MIC6, the flatter (and more uniform) it is usually, hence 1/4" and not 1/8".

Aluminum Sheets (search for MIC6): https://www.mcmaster.com/aluminum-alloy-sheets
Fan duct:  https://www.thingiverse.com/thing:2804941

Also, when I redid the build plate a couple of years ago, some things weren't readily available.  If I was to do it again, I would use this:  https://www.ebay.com/itm/Aspen-Aerogels … rk:12:pf:0

I used the 5mm Aerogel insulation on my 12x12" plate in my other printer, also 1/4", and it not only heats fast, but holds the heat very very (very) well. I can crank it to 70C, and still touch the bottom with my hands without a problem. I used a bit of RTV sealant and holds it perfectly in place.   If I have to redo this plate as the heater is a bit undersized (I have a newer one), I'd likely use this as the 8x8" plate cools off pretty quick.

Speaking of the heater, I finally bought a brand name SSR from Digikey.  The cheap ones on Amazon often are poor copies, and don't work.  The aluminum box for the SD makes a nice natural heat sink.  I went thru 3 of them from Amazon (thru different sellers), before I realized that was the issue

I also realized too late I should have posted this to the mods forum, but too late now.  It is tempting to try to add a 2nd extruder now, though may have to do a bit of DIY since not sure the parts exist, yet

Thanks for the heads up!  I had originally bought one of the silicone ones specially made for the SD that someone here used to get,  it works great and heats fast, BUT they undersized the wiring, so they get pretty warm while heating.  They released a 2nd version with upgraded wiring I've had in my cabinet for awhile as a backup, but good to know about this one

That's awesome! I hadn't heard of them before, definitely appreciate this!

The print looks great. z-band maybe exaggerated by the glossy finish of the filament, I'm sure the real print looks better than the picture.

Two small concerns:
1. layer cooling fan can use a different design, the current design is too far away from nozzle and may cool nozzle more than cool the print. I can be wrong about this since look at picture is not as accurate as look at real object in 3D.

2. Hotend cable management. the heating element wire and themistor wire is not fixed tight. My feeling is they will be slightly bend over and over when the hotend moves back and forth (will make heating element wire and themistor wire break quicker on heat block end). I would recommend add 2nd zip tie in the middle of the heating element wire and themistor wire (between your current zip tie and heating block) attach to the carriage .

last I heard they were "working in it" for other sizes. I would love one for the FT-5. might want to reach out to them and see what they have to say about it.