The is my first delta 3D printer and also the first one i’ve completely designed (and actually built) from scratch! After about two years in the making, i’ll call it “done” (for now).
In this video, I’ll go through the design and have a look at what worked out and what didn’t.
http://www.youtube.com/watch?v=gZU-N3qUbRE
Well done Tom, how much approximately was the budget for this project?
Looks great - I would like to see it printing.
@Badog_CNC_Switzerlan you can probably build one with about $400, though i didn’t keep track of it all too well.
Nice build. I have a few comments:
I also have my carriages running on the corners allthough cheap 624vv bearings on chromed steel tubes (tablelegs actually)
The bearings grinded away the chrome plating after a while of use so tried different types of tape as a bearing surface. (UHMW tape is ridiculously expensive so I wanted an alternative) I found that PET tape works really well, I have only printed 5ish kg with it and it seems to hold up nicely.
Second thing, if you mount the extruder halfway down he side of the printer you could cut the bowden almost in half. (might mess up the aesthetics but will be better for retraction.)
Third, If you go with magnetic joints at any point, do yourself a favor and put spring loaded tension strings between the carriage and effector between the rods, that way the effector rarely bumps all the way off the magnetic coupling when snagging prints and if it does decouple, the effector wont fall down into the print, saving you all the hassle of cleaning the hotend. 
(talking from experience)
That being said, I think magnetic joints rock.
Thanks for all the awesome videos.
@Mark_Rehorst the spacing is set by the top and bottom extrusions, and for getting them parallel, well… the bottom vertex does the basic job, but the aluminum sheets keep it very tightly in the alignment you set it to. To be honest, i didn’t spend much time squaring it etc, simply because the design already keeps it aligned well enough.
@Thomas_Sanladerer what is the problem with ATX supplys? have a 350W one which works great.
@VolksTrieb many ATX supplies use group regulation, which means you need to load all rails somewhat evenly or the supply might shut down or or do other weird things. Having a dedicated 5V and 12V supply just makes for a more predictable experience overall (imo).
@Thomas_Sanladerer
Oh yes I know that of course. Well most ATX supplys regulate 5V only. Some do 3.3V too. But all have unregulated 12V. Yes that is a downside. But having the Rpi with octoprint + a dummyload on 5V it works just fine. Never had issues with unstable voltages.
Really cool! I want to build a large delta.