I also strongly recommend Owen's hot end bowden clamp http://www.thingiverse.com/thing:11864.You get a positive grip on the tube, but can remove it easily if you have to get to a clog from above, or if you sometimes swap in an oversized ID bowden for oversized PLA of swollen Nylon. I made the slight mod of cutting a short section of bowden that runs the length of the wooden hot end cage. I hold it in place with a M4 washer captured between the top of the wood cage and the bottom of the base-and-riser part.
I actually always advice against this mod.
I understand the idea, but you get the same result with a normal functioning tightner and horse shoe clip.
Besides, the biggest reason for me to advice against this is that there is a rather high chance you are putting too much force on the bowden tube. Onto a level where you will be squeezing it, i.e. changing the inner diameter and create under extrusion.
Only very little friction is required to change the normal flowrate.
1. Colors
I have black and "white" (natural smart ABS by Orbi-Tech) ABS, plus clear BendLay as well as access to red ABS. I'd like to stick to one of these because I don't intend to have a big variety of ABS colors. I don't like ABS and will only use it when necessary, so I don't want to have too much of it laying around.
So, my next approach would be red frame with black printed parts. Is that far enough away from the company-we-don't-mention color scheme?
Lol I was just joking about the colors. Paint it black and red if you want to
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Hmmm... I don't have the slightest clue about materials. C45 says nothing to me. Tolerance h6? Yeah, cool. I don't know what that means...
metall-laden.ch has states the alloy is "4301I / 4301F". "property" of the stainless steel rods is "H9-S". Great, now I know more.
They also have "blank / black steel" rods. Alloy is S235JR", property says "WRMWLZ". Again, now I know everything...
I emailed them describing what I want in normal words, we'll see about the answer. Maybe they can get the right stuff, should still come cheaper than importing something from the US.
About timing belts / pulleys:
It seems that MXL belts in general are actually not suitable for the UM because there is some backlash regardless of whether you use good pulleys or not (square pattern vs. rounded pattern). So I guess I'll switch to GT2 belts & pulleys anyways. I can still use my good MXL pulleys for the first machine once the second is up and running. Right now I don't want to touch my only running system...
I found robotdigg.com as a supplier of some of the hardware I'm going to need. They make promising statements about quality, but it's all chinese stuff (and we all know what that means in this industry...). Anyone has experience with their products?
/edit:
Found another one: http://openbuildspartstore.com/
Also seems to have everything I need (except for rods :(). Anyone knows this store?
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