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La versione III della RepRap, chiamata "Huxley" è perfettamente funzionante ed è disponibile in associated pages. È basata sul progetto originale della Mini-Mendel ed è stata sviluppata da Ed, da ErikDeBruijn e da diversi altri progettisti. L'Huxley è stata chiamata così, come tutte le RepRap, in onore di un biologo /wiki/Thomas_Henry_Huxley Thomas Henry Huxley].
Per essere chiari, l'Huxley è una Mini-Mendel con diversi componenti riprogettati ed una documentazione aggiornata e molto più vasta, delle elettroniche integrate standardizzate (che, ovviamente, si possono sempre sostituire), ed un gruppo di firmware compatibili tra loro e di software per l'host testati. Integreremo il più possibile i software già sviluppati sulla Mini-Mendel.
The machine uses M6 threaded rods and M3 nuts and bolts (diversamente dalle M8/M4 usate nella Mendel) ed i motori passo passo NEMA 14. The reprapped parts are about 30% of the volume of those for Mendel, which is to say it could reproduce three times faster.
La Mendel può stampare i propri componenti, e così può fare anche la Huxley. Ancora meglio: una Mendel è in grado di produrre i pezzi di una Huxley, ed una Huxley è in grado di realizzare quelli di una Mendel. We will continue Mendel development to turn it into a multi-material machine. Huxley will be a one-material machine, though we will probably also add a Pen Plotter so we can write etch-resist on PCBs and use an Oil Pen to facilitate separation of Support Material for overhangs.
The idea is to develop both Mendel and Huxley in parallel, with Huxley being as cut-down and minimal as possible, and Mendel being the machine with all the fancy capabilities. Huxley will be the fastest replicator. La Mendel sarà la più versatile.
Instruzioni di assemblaggio
Istruzioni di montaggio per il kit Huxley TechZone, disponibile su TechZone Huxley Page.
Istruzioni di montaggio per il kit Huxley eMaker, disponible su eMaker Huxley page.
Filmati con istruzioni di montaggio del modello Mini-Mendel*
1) Part 1 Frame Assemblies 
2) Frame Integration Part 1 
3) Frame Integration Part 2 
4) X- Trolley 
5) Asse X parte 1 
6) Asse X part 2 e integrazione parti 
*Note: non ufficiali
I've (Erik) found suppliers for all of the parts, and the estimated cost of the Mini-mendel would be under 350 euros (in Europe). Note that because the design is not yet stable, you may need to order more to get everything working satisfactory.
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You can ask ErikDeBruijn for edit permissions to this Google Docs sheet.
Deep link to both of the Google spreadsheet (combined), in case reading them while embedded is difficult. 
Apart from the sources listed here, also check out the forSale-subforum in the RepRap-forum.
Frame and Rails Dimensional Variants
Silver Steel Rod (Drill Rod in the US) is a precision ground rod made from steel that has a slightly higher level of chromium in it to resist a small degree of corrosion. Intended as a tool steel for drill blanks, screwdriver shafts and axles, this is widely and inexpensively available in standard lengths of 330mm (13" UK Inches). Given its precise specifications and straightness this makes ideal rails for smaller RepRap builds like Huxley.
The rod can be cut down to work with the current Huxley dimensions or alternatively critical Huxley Frame and Carriage components can be scaled up to minimise reworking this tool steel. As this will result in a slightly larger frame, the bed and by implication build space, can be scaled up if you want. Having measured after framing up using the dimensions below it appears that a build bed of at least 200mm by 200mm is possible. Build space will be something less than that though.
All printed parts remain the same. Belt lengths will have to be increased to suit.
I (aka47) am currently working with a build using these critical modified dimensions for the M6 Allthread components:-
|Dimension||Mini Dim||Huxley SS Dim||Huxley SS All-Thread||Qty Needed||Comment|
|J1||200mm||270mm||314mm||6||Frame sides, the two equilateral triangles.|
|J2a||140mm||200mm||245mm||4||Frame bottom cross bars|
|J2b||140mm||200mm||335mm||2||Frame top cross bars|
|*||*||*||292mm||2||Z Axis Lead Screws|
|*||*||*||320mm||1||Z Axis Base Plate Rod A|
|*||*||*||295mm||1||Z Axis Base Plate Rod B|
Mini Dim, is the dimensions as described in the Mini-Mendel Mechanical Construction Notes. Basically the dimensions that Huxley is based on.
Huxley SS Dim, is how much bigger the component was scaled to minimise cutting of the Silver Steel M6 Rails.
Huxley SS All-Thread, is a suggested length of the M6 Threaded Rod for that part including some for components and fixings. This may vary a bit depending on the plastics you are using but the dimensions here worked for me.
Using these critical dimensions the X and Y Silver Steel rails do not need cutting and can be used as is. You may choose to shorten the Z axis rails a little.
All in all the final dimensions look to have worked out so as to give a bed size very similar to those first achieved by Whosawhatsis?
- Check Mini-Mendel Variation for updates and improvements.
- You can easily print these Huxley Production Files in 10 Makerbot-sized plates.
- You may print an (experimental!!!) Shelled MiniMendel using less material and time
- Individual parts can of course be printed too
Different variants of the Huxley have been sold with different electronics; the eMaker Huxley page came with Sanguinololu and the RepRapPro Huxley is provided with the Melzi, a surface mount version of the Sanguinololu that incorporates an SD card.
If you are looking to build your own Huxley and are wondering which electronics are the best, any of the established electronics that work will with the Prusa will work well with the Huxley. The common ones are RAMPS, Sanguinololu, Gen6, Gen7, Gen3. Other Mendel compatible electronics may also work.
Standard 3xNEMA14 and 1xNEMA17 (extruder) steppers. Smaller and less expensive than on the full sized Mendel.
Fornitori (motori passo passo):
Stepper Driver Sources (Allegro based stepper-drivers):
- Pololu stepper driver board - see links
(or use the BitsFromBytes-electronic that include stepper-drivers)
The MiniMendel uses a bowden-extruder that has less moving mass and thus higher speed due to the stepper not being on the print-head.
The MiniMendel uses the same 5mm pitch Synchroflex timing belt as is used on the Mendel.
"Synchroflex(R) timing belt,800Lx10Wmm" and
"Synchroflex(R) timing belt,550Lx10Wmm"
Tutti i componenti metrici sono acquistabili negli USA da mcmaster, in Europa sono disponibili comunemente in quasi tutti i ferramenta e negozi di fai da te.
Having built a frame using all nyloc nuts I (aka47) would advise caution for anyone else considering going down this road. Nyloc's are great but a real pain when you need to place them a long way along a threaded rod. The main issues were binding and stripping of threads. Next time I build I will be using standard nuts and anti-shake (star)washers.
Questi elementi possono essere realizzati in legno oppure plexiglass dal taglio di lastre più grandi. Non sono necessari strumenti complessi.
Storie di successo
- I've built an Oversized Huxley by cutting the rods and belts longer to make it almost as big as Mendel. The build platform is 8"x8" (about 195x195mm usable), but the outside is only 15"x14"x13".
- I've had a lot of trouble getting reliable extrusion, and I've taken the bowden cable out of the equation (at least temporarily) and have been working with carriage-mounted extruders. This seems to work fine with the NEMA 14 motors I bought, which meet the 13.7 N-cm torque requirement for Mendel.
- I purchased the kit from Techzonecom.com and documented my build on My blog. So far I have one good print and I have to adjust the Z axis so ooze does not occur when the Zaxis is raised.
In fase di sviluppo
- Main development seems to be going on in the RepRap-forum and on Thingiverse.
- Marcus Wolschon created a Shelled Mini-Mendel that only required 110g of ABS and less then 10h to print. (It may be filled with epoxy after printing but that is not required in all cases.)
- The Mini-Mendel is the first step in optimizing replication time; further steps in that direction are discussed at RepRap Breeder.
- Whosawhatsis? has Redesigned Y-Bar Clamps for Huxley (and Mendel) to print in one piece and require no screws. Instead, the nuts on the threaded rod are tightened-down on piece to clamp the smooth rod.
- Whosawhatsis? has Pulley Extenders to fix the x-belt alignment so that it no longer rubs against the carriage. There are also replacements for x-blunt-plate_1off.stl and x-motor-end-clamp_1off.stl that have these extenders integrated. Note that these are not symmetric, and the L-shaped portion is designed to align with the belt clamps on the carriage. The carriage is backwards in Erik's picture above.
- Erik has designed a Belt Extension Clip so that the pulley extenders can be used without a longer belt.
- Whosawhatsis? has designed an Idler Pulley for Huxley (and Mendel), suggested by Erik, to replace the mudguard washers on the belt idler bearings.
- aka47? has contributed revised dimensions for M6 frame rods based on using off the shelf lengths of Silver Steel (US Drill Rod) with minimal cutting for axis rails.
- nophead has contributed improved drive pulleys for the Mendel. As Huxley uses the same belts these are also a good idea for huxley.
- RustySpoon has contributed a pair of Bowden nut couplers so that Wades Extruder can be used together with the Mini-Mendel as the Feed for the Bowden assembly. Again these parts are use-able for a Huxley build
- nophead has contributed an improved drive gear and beefed up idler plate for the Wade Extruder. If this extruder mechanism is being used to feed the Huxley Bowden assembly then these parts are recommended.
- Google Warehouse?