Duet WiFi case design
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Can you print the cases at an upwards angle to fit it onto your bed? You'd have to print with support, but that's always fun.
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Aargh. They're all too big. Which is because the Duet WiFi is too. Thanks for pointing me at them, though! I'll see if I can come up with something that prints in pieces.
AFAIR you have a Mini Kossel. I had one too and I found the bed size too limiting. So I lengthened the horizontal extrusions and rods, and fitted a larger bed to give me a printable diameter of 300mm. Of course the maximum print height was reduced, but I didn't think that would be a problem. Before long I found the print height too limiting, so I rebuilt the printer using 2020 extrusion and metal corners, keeping the same bed and rods. That build is described in my blog.
If you let us know what country you are in, perhaps another user will print your chosen case and send it to you. Failing that, you could try 3DHubs.
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Oh, a larger size is definitely on my wishlist. Though with 1515 extrusions I worry about the printer getting floppy. Anyway, for the moment I think I should stop upgrading the hardware and try to tune the printer so that the hardware I have works well. Turns out buying hardware upgrades means more tuning and tweaking, not less.
Which is not to say I don't want to tidy the printer up - so far the emphasis has been on getting it to work at all, so all the electronics are just lying there connected by a rat's nest of wires. Beyond zip-tying them to make "cables" I haven't figured out how to turn it into a tidy project.
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The T3P3 Mini Kossel kit places the electronics (Duet 0.8.5, same size as the Duet WiFi) under the bed. That might be an option for you too, if your motors are not too long. See https://docs.google.com/document/d/1_pZ6I5YPYf4iCJioK4b_rB7N8JDBsEia6j6qo3B17Bk/pub.
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I tried that, with the RAMPS electronics, and they got worryingly hot, perhaps even causing some of my layer shifting problems. Definitely things improved when I moved the electronics out from under the bed. The Duet WiFi would definitely need forced-air cooling, and I'm not sure there's quite enough room.
Another option might be to mount it on top of the ATX power supply. That box has to be near the Duet WiFi anyway, and it provides a base against which to mount the Duet. It's not so satisfactory to have two units connected by cables without a convenient connector, but the ATX supply definintely won't fit anywhere inside the printer frame. And I could probably get away with mounting the Duet WiFi on the side of the PSU that already has a fan, for a little bonus cooling of the stepper drivers.
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I tried that, with the RAMPS electronics, and they got worryingly hot, perhaps even causing some of my layer shifting problems. Definitely things improved when I moved the electronics out from under the bed. The Duet WiFi would definitely need forced-air cooling, and I'm not sure there's quite enough room.
Lots of people (including me) mount delta printer electronics under the bed and don't have any problems. The plug-in drivers on RAMPS are very poorly cooled, also the mosfet it uses for the bed heater is poorly chosen and gets hot, as does the 11A polyfuse. Whereas the drivers on the Duet 0.8.5 and Duet WiFi are well-cooled through the PCB, and the bed heater mosfet generates very little heat.
In summary, you need have no worries about installing as Duet or Duet WiFi below the bed of a delta printer if you follow these simple rules:
1. Use a cooling fan to blow air over the electronics (as in the T3P3 design) and make sure that air can enter and leave the space under the bed between the extrusions. Although with typical motors, the Duet WiFi generates so little heat that you would probably get away without a fan.
2. If the bed is heated, use thermal insulation under the bed.
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I'm making a mount/case for a Prusa, I'll share on thingiverse in the next couple of days once I've printed & mounted it.
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Don't use the http://www.thingiverse.com/thing:1664181 … holes are not in the right place and it will get a redesign in the future.
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Here is one I made buy cutting up and repurposing Davids one: http://www.thingiverse.com/thing:1791405
Just a front panel that connects to 20x20 t/v-slot with t-nuts
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Here is my Prusa mount
http://www.thingiverse.com/thing:1827888
(My clearance on the mount points is a little shallow but this can easily be updated in the OpenSCAD file)
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I might see if I can design a case that prints "vertically" - that is, orient the long axis vertically for printing purposes. Of course that means mounting holes get messy, but I have drill bits. And I'd print end caps separately. It's a weird way to design a case, but it might be printable on my annoyingly-small printer. I'll post something here if I get it working. And upon reflection I think the best approach is to mount the Duet WiFi vertically below the extruder, on the Z tower. Ideally I'd come up with a panel-mount Molex connector so I could plug any ATX supply into the setup.
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Anne for horizontal holes have a look at "truncated teardrops"
http://blog.reprap.org/2008/07/every-little-helps.html
They print well becasue there is no overhang greater than 45, and then a bridge at the top.
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Added mine to Thingiverse as well http://www.thingiverse.com/thing:1830918. It has an enclosed 80mm fan to blow on the underside of the board, exhausting through slots top and bottom. Cable entry is left side but I've included the open scad file so it'd be easy enough to change.
