Finally have circles printing perfect on my corexy. I replaced all the printed carriage parts with new ones. Found two bad belt idler bearings in the process. I also removed one of the linear bearings on my extruder card (only 3 needed to establish a plane anyway). Now all mechanical parts run smooth as greased lightning. I can run 150mms print moves no problem now with .05mm consistency. I also ditched the dual extruder. I never used it anyway.
Printed the 45mm tree frog scaled up for fun with a little post process sand/file with an acetone smoothing at the end. Then printed a huge spiral vase from thingiverse for kicks. The vase is pretty cool, covered in car mfg logos.
*Update: added a pic and video of printing some spares for my next build in red abs. I am building a # Eustathios by @Jason_Smith . Printed at 70mm/s and bumped to 150% speed after first few layers were down.
Sorry I just noticed g+ enhanced the videos making them likely to give anyone sea sickness with googles CRAPPY stabilization. I am reverting them now. Anyone know how I can keep image auto enhance by default (which works well), and kick the video stabilization to the curb. MAN IT SUCKS.
On your carriage you now are running 3 bearings instead or 4. Is the 3rd one exactly in a triangle pattern or is it off set so the bearings would be in more of an L configuration.
@Wayne_Friedt it is in a triangle. Two by the extruder to set the axis. One at the cart center behind the stepper to establish the plane. Now my micro chatter from misalignment is nowhere to be found.
@James_Zatopa thanks. How’s your new bot running? Haven’t seen any pics since the show. Did you get the twist/misalignment issue between the two z leads figured out?
I have a reprap that uses 3 bearings in a L shape. It works well. This is good timing as this last week i was considering only using 3 on my big bots. My Soli has 4 and this acrylic bot i made has 4 but i haven’t printed with it yet.
@Wayne_Friedt I think it might depend on distance of the load from the drive belt/cable to the bearings. And location of the nozzle to the two bearings that establish the axis. These relationships and the stiffness of the carriage are all factors to avoid vibrations intoduced at the nozzle during rapid movements.
I got that all figured out and found a new problem, I’m waiting for parts to try a new z axis design.
@Stefan_Freeman thanks. Did you ever build a large format printer for work?
@Eclsnowman Not yet, too many other projects to work on. But I ordered some parts and going to rework the i3 at home.
