How to forget about circle problems for ever.... (Page 2 of 4)

Have been running this mod for a month or so.  1" circles are within +/- .002".  A side effect of this and a few other rigidity improvements is that a very slight moire pattern is back on some circles (updating and de-tuning the extruder driver had gotten rid of that issue).

Really barely noticeable, and only on some magic diameters.  I guess they used to be hidden by larger amplitude chaotic wiggles of the entire system. High order problems of no significance.

IMO this is a good, useful upgrade.

its done on an SD3, and will work fine for 2's and 4's as well....

Ok I wanted to try this mod but I'm having trouble printing the pillow block. Any suggestions? I printed it right side up, no support. Do I really need to be using support for this?

The problem appears to be that the top layers stay too soft when printing and "spring" back up. I'm printing ABS at 200c, with 105c bed temp, and 40c case temp. Funny that my black ABS doesn't seem to have as much "springiness" to it than my green does but I thought black was supposed to be harder to print.

I may be able to salvage this by just drilling out the 6mm hole to be round and put the bearing in there? What do you think? But I'm wary about things being less than perfect when it comes to something that will be guiding the y rod. Edit: NVM no it won't work because it's not just the 6mm hole that would need to be reformed it would need to be all of the circle part and if the bearing is not centered in there perfectly it's going to be off axis and not work right.

Like Tomek says side print it for strength if your bore is indented on both sides use support... it won't be much anyways.

Will be interested to hear how it goes. Have you still got the first loop belt off the motor installed ?

Actually, the most accurate circles are usually had with less polygons.. its all a factor of its size and what the 'circle' is for

Best described here: http://hydraraptor.blogspot.com.au/2011 … holes.html

And I would hope that most peoples circle assement was based on the relevance to the model - in that yes a 50mm wide 24 polygon circle from sketchup will look like... well.. a 24 polygon circle .. But I guess you never know as its a presumption one must make from the other side of the interwebs

Ok got it to print and got the bearings installed.

Going to install it when i get my new y rod (thought I'd start fresh) and crank that y motor tight to the case.

One question. Do I want to install pillow block to case with y belt (the vertical one) on or off? Im assuming off, because I don't want it to put any pressure on the rod before I have this device on which prevents that pressure from bending the rod?

Also, for drilling the holes, what worked better for you guys, dremel or drill? If dremel, what kind of diamond bit?

in the middle is ideal I would imagine, However you cannot put dead in the middle with SD3 because if you drill through the metal you will hit the main wires in the back unless you untape them first (but I'm no sure where to get black tape like that)

I ended up having to disassemble quite a bit in order to get the rod completely out to get the block further down. It's all good now! Haven't gotten a chance to test it out

im going to murder whoever put this damned rod in ..........

nope, this much frustration deserves murder!!!    lol