Currently over £1K. Why is everything so expensive? I'll never understand how a couple of cheap items can still accumulate to something expensive if there's enough of them. 

I should mention that an extra screen and 5kg of filament is in this BOM, as well as the linear rails and motors for the dual arm attachment (I have an expectation that the only way both arms would fit is if they merge) but uncalculated things like the cartridges are not in here. 

The prices are also what AliExpress charges me, and they charge an additional 20% for VAT on things from a single seller under £136.

So far, the biggest outstanding sectors are:

• £113 for motors
• £335 for linear rails and ballscrews
• £181 for motherboard and other electronics
• £216 for UV equipment

Other than the extra screen, the UV equipment price is as low as it's going to get. Motors are a similar story. 

Due to precision requirements, most of the linear rails are locked in. Due to time constraints, I don't really want to chance putting lead screws on the heavy cartridge axes. I looked into 16mm smooth rods but it doesn't look like that's going to save any money. I might be able to use the 42.4mm side beam but it could potentially mean that I have to use a longer ballscrew so that it can be fixed at the other end.

"Other electronics" is likely to increase as I haven't priced in the relays used to cut down on the physical amount of stepper drivers needed in the printer.

Oh right and the air filtration system isn't in the BOM. That's probably going to cost another £60 and up.