Pledges/Cerberus

I have started to build a delta printer. It still needs many parts

The item

New concept of a delta-robot-type 3D printer, using aluminum extrusions as rails and thread as drive mechanism

Varies... because this is somewhat dynamic. I will list what we need though, below
Some items are very clearly priced, like the hotend for example.
Others not at all, if only for reason of quality differences and quantity (filament)

Apart from what I've already bought, it will need:

A heated bed, if possible round.
An extruder, type Airtripper (bowden), direct drive, for filament 1,75mm
A hotend, for 1,75mm filament, 0.50mm extruder opening(*), from hotends.com, ie. not some chinese knockoff clone shite.
Filament, PLA, 1,75mm. (What we have is 3mm, but that can't be used in a Cerberus)
Better stepper drivers than what we have now; they have a reputation of overheating problems.
Depending on heated bed, a much more powerful PSU than we have in stock (500VA / 700VA)

To clarify the above requirements somewhat better:

A delta has a light carriage since it doesn't carry the extruder. Therefore, the extruder can be dimensioned very heavy and powerful. At the same time, the filament must be thin, because it passes a bowden tube, and that doesn't work well with 3mm filament. Since the carriage is so light, it can move very quickly. It can print very quickly too, provided that the hotend can keep up. For the hotend to keep up, you need a very high quality one with a 'large' extrusion opening (0.5mm) since it is much easier to push filament through a keyhole than it is to push it through a pinhole. And if the extruder or the hotend is underpowered or underdimensioned, all the speed the printer would be capable of goes to waste, because it won't be able to run at the top speed it could have attained.

In order to build the prototype / delta frame with moving parts, the following material was purchased by me already:

Aluminum extrusions: 75 euros
Custom-made CNC-manufactured coated bearings, pulleys and drive shafts: 115 euro incl. shipping from US
4 stepper motors: 65 euros
Spectra(R) drive thread/filament: 20 euros
Misc metal and wood parts: 30 euros
Carbon fiber supports, bearings: 25 euros