Are these dual-extruder printers worth the money?

[curious aardvark]

get the qidi pro.

The other twoo would be fine for an experienced 3d printer who doesn't mind basically rebuilding it before it'll work properly.

The qidi pro - is the upgraded version of the tech 1 - touch screen, wifi, can restart prints if the filament runs out or breaks.

Calibration can be tricky - but that's pretty much standard for any 3d printer (apparently even the ones with auto calibration).

you have to read the descriptions to find the differences :-)

The QIDI TECH 3D Printer with metal platform support rod, which upgraded to 12mm, and also including upgraded parts like motor, main board, and mechanical structure, ensuring more stable printing.

Basically - yes it's worth the extra money.

As far as dual prints go. The qidi, flashforge pro, biqu etc are probably the easiest of the fixed dual nozzle systems to use (I have 2 - though one has had one of the extruders removed, as if you don't use it - it's a bloody annoyance)
If you can afford it get an idex (independant dual extruder) machine.
But cheap they are not. https://tiny-machines-3d.myshopify.c...ot-t-rex-3-500

But awesome they are :-)

But as long as both nozzles on the qidi are perfectly level - it works pretty well.
As far as slicers go - really really important !
for me - flashprint is hand down the best for the replicator dual clones (what all the 230x150x150 boxes all are). Makes using two materials really simple.
I have so far failed utterly to get simplify3d to do a succesful dual print. That said I haven't tried for a while (couple of years), the new version might work.

You should be able to use flashprint though - which is free :-)

Dual extrusion actually isn't anywahere as useful as you think it's going to be :-)

Because of the purgewall it uses a lot more filament and takes a lot longer than a single nozzle print. You can also get issues with a print head catching on what the other is printing.
But it is a nice option to have. haven't heard of any major issues with nozzles catching on the qidi's - so hopefully not a problem.

But, yep - unless you can afford an idex system, then the qidi x-pro is about as good as it gets for conventional dual extruders.

They do have their own slicer: qidiprint - but as it's 64bit only, I can't test it on my own systems - I am rebuilding a system for a client this afternoon - so I'll have a look on there.
Looks like a customised version of original cura (way better than current cura). So flashprint will probably be a lot better :-)