Best posts made by Dino

@rcarlyle It looks like it would work really well, but I just couldn't justify dropping $65usd on a filament sensor.

I would strongly avoid anything that website sells, they are marketing a 12v relay as able to switch 220v mains.

"Ideal for silicone beds up to 450W approx. (max up to 40x40cm)

We also leave the connection of the pins for use with 220V beds:"

Mechanical relays in general are much more prone to failure in addition to being noisy.

I strongly suggest you do a lot more research into working with an AC bed before you proceed any further, as mains voltage can be deadly. There are many relevant topics on the duet forums in the past few days that at the bare minimum I suggest you read.

@dc42 I'll second this, I set up firmware retraction on my delta two weeks ago, you really need to use post processing in order to get the G10 and G11 commands inserted into the right spot.

The script is pretty simple, just use a known speed and distance and then post process to replace those moves with G10 and G11.

http://thrinter.com/using-firmware-retraction-with-simplify3d/

This will work well, but he's using absolute extrusion distances, so you'll need to edit his script a small amount.

Just open a gcode file you've sliced in a text editor and double check the post processing has been done properly.

Hooray, I'm glad you got things sorted, the duet is a fantastic board, as for your fans there's plenty of posts regarding hooking 12v fans up to a 24v system. Basically you can use a buck converter to go from 24v to 12v and feed that into either the middle pin of the fan selector jumper or into the + lead on a fan, as long as you're connecting the - to the fan connector of your choice your fans will work.