Finally got some work done for my modified Spider V2 build. Thanks to @Eclsnowman for this wonderful printer and the near-to-perfect github repo with all the stuff. I had some extrusion lying around so i did some cutting and sanding with a friend yesterday and we managed to finish the frame. Instead of drilling holes we used some great connectors that i also had from other projects. We added some additional corner brackets - geometry is perfect as far as we could measure.
At the end this will be partly a @Walter_Hsiao modded version with ballscrews. Against Walters strategy i ordered them with 8mm end milling so they should fit in the bearings like the original planned ones. The only mod will then be his bed support (http://www.thingiverse.com/thing:854267) for the ballscrew nuts. I also ended up getting the chinese friends to turn the ballnut in the right direction for me - that hopefully saves me from printing Walters inverter (http://www.thingiverse.com/thing:809141)
I’m still unsure which material to use for the printed parts and what electronic options i choose. I still have a smoothieboard from the kickstarter lying around but RUMBA or one of the newer DUE-Boards (like RADDS) would also be an option. I ordered at Robotdigg today and added some 0,9° motors - therefore a fast electronic with 1/128 microstepping would be deluxe of course.
@Eric_LeFort@Eclsnowman i buy them at http://motedis.com which is my extrusion supplier for most of of my needs (located in germany as i am). I know that there are others offering them but you don’t get 'em everywhere.
One of the most important facts about these connectors is that you can easily adjust them later - just undo the screw a bit and you can move the slot not to wherever you want. The only downside is that it blocks the slot a bit. That’s why we turned it upside on the two crossings that hold the upper end of the z-bars so we can fit a bracket underneath. All others are turned downwards so you don’t see them.
For additional stability (which is not needed on a machine of this type i guess) you could of course also do two connectors on each connection.
sidenote: I had the extrusion in stock in my shop as i said but the estimated price for everything cut to the right dimension would have been costs of around 25€ at Motedis. Adding the connectors (which aren’t that cheap of course than the simple screws you need if you drill holes in there) would make it about 40-50€ i think. Misumi would have cost me around 120€ for all the profiles cut, drilled and tapped. So maybe a good solution if you’re looking to save some dollars.
@Derek_Schuetz i could try to video that the next days. Actually they’re not that cheap but still cheaper than ordering the drilled and tapped extrusion from misumi.
