Re: New heater block to fit standard nozzles on Ultimaker 3
Posted: January 11th, 2017, 10:43 am
Hi anders.
I got the ok to share my findings.
I did a lot of changes on my um3 to push forward and remove some of the stuff I found a bit of an issue.
First. I asked Gudo if he could mod my core to 1.75mm. After many talks about how to do it I send him two of my cores and we thought of a Flexible-fixed-point solution to avoid any damage on the heatbreak and allow for easy swap for the nozzles.
The advantage I saw on my tests is that with this flexible-fixed point there's a huge reduction on the ringing on the prints. Because um3 printhead is heavier and uses a very small X misumi bearing, that makes it prone to wooble when shifting directions (as I saw using the slowmo 250fps) but with this fix the cores don't wooble when they are idle, transmitting less vibrations to the print. Also they become more stable and with less ringing.
I really hope someone uses this on future cores since is a step forward in quality. Ofc if you use standard um3 profiles you won't notice a thing since Cura uses a lot of tricks to make the printhead move with 500 accel/5yerk when printing the 'visible' areas. Ofc that has a lot of disadvantages when you want to print faster and not in 3 days for a big print....
This are the photos Gudo made of the mod before returning the cores to print with them. I must say that he is a really really brilliant guy.
We are sharing all this since our goal isn't to 'SELL' but to improve further the quality as much as possible. And this flexible metal point really allows the head to be more stable and also stay flexible without compromising the way the core works. Probably Gudo can share more info about how he installed our idea.
So. Next mod.
The Printhead woobles a lot if you remove the Cura accel/yerk tricks.
After many attempts to print a bearing to make the small Y bearing more stable I found out that misumi sells a 0.5 small bearing that could fit inside the printhead. Cost is 0.7€ each and after installing 2 of them inside, the stability of the printhead improves BIG time (if you want to print fast without Cura accel/yerk tricks).
I will post misumi model and photos later when I get some time.
The third mod I did is to remove all the white slideblocks and replace them with a GT 608T and that also increased the reliability of the prints. But that fix, isn't for everyone since is very easy to break the slideblocks when removing them. But will post photos also.
I got the ok to share my findings.
I did a lot of changes on my um3 to push forward and remove some of the stuff I found a bit of an issue.
First. I asked Gudo if he could mod my core to 1.75mm. After many talks about how to do it I send him two of my cores and we thought of a Flexible-fixed-point solution to avoid any damage on the heatbreak and allow for easy swap for the nozzles.
The advantage I saw on my tests is that with this flexible-fixed point there's a huge reduction on the ringing on the prints. Because um3 printhead is heavier and uses a very small X misumi bearing, that makes it prone to wooble when shifting directions (as I saw using the slowmo 250fps) but with this fix the cores don't wooble when they are idle, transmitting less vibrations to the print. Also they become more stable and with less ringing.
I really hope someone uses this on future cores since is a step forward in quality. Ofc if you use standard um3 profiles you won't notice a thing since Cura uses a lot of tricks to make the printhead move with 500 accel/5yerk when printing the 'visible' areas. Ofc that has a lot of disadvantages when you want to print faster and not in 3 days for a big print....
This are the photos Gudo made of the mod before returning the cores to print with them. I must say that he is a really really brilliant guy.
We are sharing all this since our goal isn't to 'SELL' but to improve further the quality as much as possible. And this flexible metal point really allows the head to be more stable and also stay flexible without compromising the way the core works. Probably Gudo can share more info about how he installed our idea.
So. Next mod.
The Printhead woobles a lot if you remove the Cura accel/yerk tricks.
After many attempts to print a bearing to make the small Y bearing more stable I found out that misumi sells a 0.5 small bearing that could fit inside the printhead. Cost is 0.7€ each and after installing 2 of them inside, the stability of the printhead improves BIG time (if you want to print fast without Cura accel/yerk tricks).
I will post misumi model and photos later when I get some time.
The third mod I did is to remove all the white slideblocks and replace them with a GT 608T and that also increased the reliability of the prints. But that fix, isn't for everyone since is very easy to break the slideblocks when removing them. But will post photos also.