Video of it printing here: https://youtu.be/bAI9mNnLWFo . I still had a bit of wiring to clean up, and I'll be reprinting the blower fan mounts in black. There's also a little bit of stringing; I was still tuning the retraction.
This is an Ultimaker 2 derivative called the Alumimaker 2. It includes several design improvements, but most importantly, being made with 2020 extrusion, it is easy to modify and expand the build volume (easiest in Z, but also easy in X and Y.) I decided to design this because the Ultimaker 2 has received great reviews, I wanted to experiment with their motion system, and I wanted a system that I could easily upgrade to dual extrusion. This printer uses a number of stock Ultimaker 2 parts, leveraging a known good design.
- Easily modifiable/upgradable chasis
- More rigid frame
- Direct drive motors eliminate compounded backlash in X & Y
- Grub screws on radial bearings eliminate linear shaft displacement
- Improved electronics (Smoothieboard derivative w/ DRV8825)
- Increased Z build height
- Less expensive
- External Dimensions: 340 x 350 x 470
- Bowden extruder (Stock Ultimaker 2 or a different one)
- Build Volume: 225 x 230 x 320 for this build, but easily expandable
- This build is single-extrusion, but there’s a mount on the print head for another hot end; dual extrusion is trivial to set up.
- Print speed: 30-300mm/s
- Heated bed
- Smoothieware-compatible electronics.
This is a work in progress. I'm putting up a build log at https://sites.google.com/site/alumimaker2/build
More photos at https://flic.kr/ps/2Zb9za
I posted a BOM and some more description here: http://www.reddit.com/r/3Dprinting/comments/2rzjwc/misumi_usa_contest/cob4802
BOM Updated 5/5/15
These are all the basic parts. I've currently left out a few things:
- You can use the Ultimaker 2 stock extruder. If you do, get the torquiest 0.9 degree stepper that you can find. I ended up going with a different bowden extruder with a NEMA17 with an integral planetary gearbox.
- Use whichever electronics you want. You can source OEM UM2 electronics from AliExpress, or use a SmoothieBoard, or RAMPS, or UM1 electronics.
Misumi Specific Parts
- 12 x HFS5-2040-300 Extrusion
- 4 x HFSB5-2020-450 Extrusion
- 4 x HBLCR5-B Corners
Hardware - Get from Misumi, McMaster-Carr, Ebay, whatever
- 4 x 8mmx328mm precision shafts (e.g. Mitsumi PSFJ8-328)
- 2 x 6mmx278mm precision shafts (e.g. Mitsumi PSFJ6-278)
- 2 x 12mmx430mm precision shafts (e.g. Mitsumi PSFJ12-430)
- 100 M5 SHSC
- 100 M5 T-slot nut
- 6 x M4 T-slot nuts (sorry, the KP08s don't fit M5...)
- 14-16g wire
- 12 x M3x8mm (for mounting motors to motor plates)
- 12 x M4x8mm (for mounting KP08)
- Loctite (there's lots of set-screws in this build)