Huxley

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Revision as of 15:36, 1 May 2010 by MarcusWolschon (talk | contribs) (Timing belt)
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Huxley

Release status: experimental

Mini-mendel.jpg
Description
License
unknown
Author
Contributors
Based-on
Categories
CAD Models
External Link

A miniaturization of the Mendel design. The machine uses M6 threaded rods and M3 nuts and bolts (as opposed to the M8/M4 used on Mendel) and NEMA 14 steppers. The reprapped parts are about 30% of the volume of those for Mendel, which is to say it could reproduce three times faster.

Here's a close up rendered by M.BrittCrane: MiniMendel.png

I've 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.

<iframe width='900' height='400' frameborder='0' src='http://spreadsheets.google.com/pub?key=tw60t_E6G8tVNhBgMqAjcbw&single=true&gid=0&output=html&widget=true'></iframe>

<iframe width='900' height='400' frameborder='0' src='http://spreadsheets.google.com/pub?key=tw60t_E6G8tVNhBgMqAjcbw&single=true&gid=1&output=html&widget=true'></iframe>

You can ask ErikDeBruijn for edit permissions to this Google Docs sheet.


Parts

Apart from the sources listed here, also check out the forSale-subforum in the RepRap-forum.

Printed parts

Electronics

Identical to Mendel or you can use the BitsFromBytes -electronics that allow standalone operation from SD-card. When using the BitsFromBytes electronics, be advised that this requires a proprietary tool chain to build new firmware that works with the mini-mendel. Also, the latest versions of the source code for their electronics are frequently not publicly available.


Sources:

EU:

Steppers

Standard 3xNEMA14 and 1xNEMA17(extruder) steppers. Smaller and less expensive than on the full sized Mendel.

Sources (steppers):


Sources (Allegro A4983 based stepper-drivers):

(or use the BitsFromBytes-electronic that include stepper-drivers)

Extruder

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.

Sources for parts:

Timing belt

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"

sources:

Nuts and bolts

All metric and obtainable in every home-improvement-store. 608-bearings can be found cheap everywhere you can buy or repair a skateboard.

Thick sheets

These 2 sheets can be cut from plexiglass or wood with simple tools.

Success stories

Ongoing development

  • Marcus created a Shelled MiniMendel 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.)