Im feeling restless… How do you think a Ultimaker will scale to 300x300? Some one has to have tried this before? Is it madness to keep the 8 and 6mm rod configuration? Finding the bushings and pulleys gets hard if you go bigger then 8mm… How about a all 8mm configuration?
Check out the Eustathios Spider V2 & HercuLien designs. They have the ultimaker motion w/ larger footprints
@jerryflyguy HercuLien 
@Eclsnowman 
sorry… spelling was never my strong suit
@jerryflyguy that’s ok, it’s not an easy name to spell. I should have picked something easier
6/8 basically maxes out at the ~200mm size Ultimaker builds them. To maintain performance you need to scale up the rod diameter roughly in proportion to the increase in axis length. Or keep the rods near L<D*30.
Seriously, do check Eustathios or HercuLien! Great aluminum extrusion designs inspired by the Ultimaker and other designs, plus a great community and fully open source!
Thanks for all the input! The Eustathios looks really good! And it fits my core xy frame perfectly!! Sure i will need to make som adjustments to adapt it fore a “box” frame but that shouldn’t be much problem…
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This is the fram that im re-using. will keep the z axis to.
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Thanks for the Eustathios tip. This design looks really easy to adapt.
Planning on combining the two corner mounts and make them line upp to the top edge of the box to make it easy to square up.
Box version will be done soon!
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Look inside the community upgrades folder as well on the github. They came up with some great additions and modifications.
I m very interested by a Box frame version
I built a 200x300mm ultimaker-style printer with 8mm rods, which works quite well. I would definitely not use 6mm rods for this (even on a regular ultimaker the 6mm rods are a bit on the thin side). The longest 8mm rod (which is around 450mm in my design) noticeably wobbles when it rotates (it’s a good quality linear rod, just hard to get completely straight ones this long). Given the chance to build another printer, I would probably scale up the rotating rods (not the carriage rods) to 10mm or even 12mm in the hope they’d be straighter. Since they don’t move, they don’t add much inertia anyways. Though the easy availability of 8mm bushings might constrain you to 8mm, which is totally workable as well.
Nice printer tom. 10mm looks good bigger than that and small pulleys gets hard to source.
Oliver i will upload it to the community upgrades when im done.
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@Markus_Granberg thanks