Prusa i3 Hephestos

I'm trying to put together an accurate BOM for the Prusa i3 Hephestos (http://reprap.org/wiki/Prusa_i3_Hephestos [www.thingiverse.com]) and am running into some problems. Their build instructions are good, but the BOM is TERRIBLE (https://github.com/bq/prusa-i3-hephestos/blob/master/bom.txt). Bad formatting, lack of proper part descriptions, etc, etc...

Is anyone else building one of these, or thinking about it? The design is gorgeous, and looks like it'll solve a lot of issues I have with the i3 Rework, but just trying to figure out what I need to buy is turning into a massive PITA.

[reprap.org] looks fairly detailed to me.

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Ralph.Hilton
[reprap.org] looks fairly detailed to me.

Helpful response.

The lack of organizion is the first major problem. To find out what you need from the wiki's BOM you need to go through and add up parts. Not a big deal when you're dealing with a few different parts, but when you're taking about all those different screws... Oh, and the wiki's BOM doesn't even list all the parts. Try figuring out how many linear bearings you need from that BOM.

Next problem: Sourcing parts. The drag chain is a perfect example. I can't figure out why they didn't just print the damn thing.

Documentation on the extruder is bad as well. Basically, the wiki page is focused on assembling a kit you buy from bq, and isn't very helpful if you're in the US and have to source everything separately.

Edited 1 time(s). Last edit at 07/13/2014 06:27PM by SimianSteam.

It does look a bit hard to figure out and printing the chain shouldn't be difficult from a thingiverse design. Looking at the site I don't see any particular advantage offered by that design. I'm curious why it is of interest.

The chain? Easy and clean wire routing.

Part of using open designs in a DIY build it having to go through and compile some things yourself. You are being provided a free design with excellent documentation and I don't understand the sense of entitlement because you can't be troubled to compile a few parts. In the time it took to make that post and read tthe first reply you could have made a single sheet BOM and shared it as your contribution to the project. It will take less than five minutes.

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vegasloki
Part of using open designs in a DIY build it having to go through and compile some things yourself. You are being provided a free design with excellent documentation and I don't understand the sense of entitlement because you can't be troubled to compile a few parts. In the time it took to make that post and read tthe first reply you could have made a single sheet BOM and shared it as your contribution to the project. It will take less than five minutes.

Actually, I spent a few hours doing just that BEFORE I made the first post, or at least part of it. As I stated in the OP, the provided BOM isn't complete, and it's making compiling a better one difficult. The intention of this thread wasn't to bash the documentation, but to collaborate to improve it. I'm working on a spreadsheet that can be shared to make the process easier.

Seems to be a lot of people poking their heads in to talk trash without actually contributing anything, so I'll go ahead and say this right now: If you want to help, or if you're building/thinking of building one of these please, join the discussion so we can make the process easier on everyone. If you just want to criticize or otherwise be a smart ass then please let me kick you right out the freaking door.

Back to the original topic now. Hopefully someone with a legitimate interest and not just a holier-than-thou attitude will want to join in so we can all benefit.

Edited 1 time(s). Last edit at 07/13/2014 08:53PM by SimianSteam.

it amazes me all these prusa i3 derivatives no wonder people get confused

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Check my rubbish blog for my prusa i3

up and running
[3dimetech.blogspot.co.uk]

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chris33
it amazes me all these prusa i3 derivatives no wonder people get confused

Indeed but Reprap is all about iteration. It's not so much the project is changing as it is the demographic is changing. It's shifting from a DIY culture to a user culture more interested in getting an inexpensive printer rather than advancing the making of printing. Just different folks wanting to do different things. In the nearly three years I've known about Reprap there has been a significant shift from developers to users. Before there were still many iterations and designs (though not quite as many as now) and the community wasn't big enough to build large numbers except for a few models. The iterations now, particluarly with regard to Rework are lower cost frames, fewer parts and more streamlined assembly. Generally I think it's a good thing but I'd agree that it can be confusing even for those that have been doing it a while.

For those looking at the Hephestos when you go to Github and view the sources there is a single sheet BOM. [github.com]


Alberto Valero is the maintainer. There are OpenSCAD sources, a Marlin config and dist and STL files. Other projects could use this as an example of how to document a variant.

Allen key s/long Ø 2mm 1
ALLEN KEY S/LONG Ø2,5 FORUM 1
Ceramic screw driver trimmer for electronics 1
Precision Needle 0.4mm diameter 2
Printed tools: spanner and holder 1
Ramps 1.4 Kit 1
Stepstick Drivers A49988 4 layers 4
Mechanical Endstop 3
Smart LCD Controller 1
USB Cable 1.8m A-B 1
4 wire red blue green black (1 meter) for RAMPS 4
Nema 17 48 mm sin conector 42BYGHW811 4
bq Direct Drive Extruder wiring kit 150 cm length 1
Bi-colour wire 2 x 1,5 mm 0,15
AC/DC Power Adaptor SA1208 - 12V DC - 8A with 2.1mm Jack Connector 1
SCHURTER 6003.0215 - Cable; 1
2.1mm female Jack connector to two wires clam 1
Printed support for lcd, ramps and fan 1
Tornillo M3x12 Screw - DIN-912 8.8 Class Black 4
M3 Nut - DIN 934 Class 8 Black 38
Heat shrink tube 2.5 x 500 mm 0,5
Black bridle 100 x 2.5 mm 28
Brushless DC Cooling Fan - RD5010B12H 1
Plastic Drag Chain Link 15x35 mm 52
Marcha Direct Drive Extruder 1.75mm 0.4mm for RepRap Printers 1
Witbox extruder Support for Prusa i3 1
Tornillo M4 x 6 Din 7984 2
M3x10 Screw - DIN-912 Class 8.8 Black 35
Tornillo M3 x16 Screw - DIN-912 8.8 Class Black 8
M3x18 Screw - DIN-912 Class 8 Black 2
Ø8X370MM-CROMAD Smooth rod 2
M3x20 Screw - DIN-912 Class 8 Black 9
Tornillo M3x25 Screw - DIN-912 8.8 Class Black 8
M6x40 Screw - DIN-912 Class 8.8 Black 1
M5 Nut - DIN 934 Class 8 Black 4
M6 Nut - DIN 934 Class 8 Black 3
Printed x axis for Prusa i3 1
Axial Ball Bearing 623zz 2
GT2 Pulley 20 dientes 2
GT2 Timing Belt 6mm 2
Linear Ball Bearing LM8uu 10
Ø8X340MM-CROMAD Smooth rod 2
M10X370MM-NE Threaded rod 2
M8X205MM Black transversal rod 4
M8 Nut - DIN 934 Class 8 Black 22
M10 Nut - DIN 934 Class 8 Black 12
M8 Washer - DIN-125 Class 6 Black 22
M10 Washer - DIN-125 Class 6 Black 12
Printed y axis for Prusa i3 7
Aluminium Prusa i3 Frame and Bed 6mm black 1
22 x 22 x 10 mm acrylic printing bed for RepRap Printers 1
Standard Spring 30.5x4.5x0.45 4
Black binder clip 4
Ø8X320MM-CROMAD Smooth rod 2
M5X300MM-NE Threaded rod 2
Aluminium Flexible Shaft Coupling 5to5 2
Printed z axis for Prusa i3
Glass 3mm 220x220 4EC 20x20 1
Jumper Wire (3 wires) with connectors – 40 cm 2
Jumper Wire (3 wires) with connectors – 85 cm 1
Hot End security 1
M10 Serrated Nut DIN 6923 Class 8 black 4
M10 Washer DIN 9021 Black (outter diameter 30mm) 4
Wire ferrule 1,5mm 4

by the way, open source is supposed to lay on community. One does not just make a question and waits for another to solve it... if you really believe on open source you are part of the product and you do your best to improve the product (including documentation)

If you feel BOM is shit, just improve it

Attached BOM in spreadsheet, I hope it helps