Blake215 0 Posted December 29, 2015 in My UMO+ will not print a perfect circle I have an UMO+ and it will not print a good circle on the factory settings. Therefore, I tried the nickel calibration test on thingiverse, to calibrate my X and Y axis, I have done it over 11 times, and have followed the instructions to change the steps/mm. However, nothing I have done has fixed this problem solar, and it is very difficult to make accurate prints if my printer cannot make a circle. If anyone can help please let me know what I need to do. In these photos the rectangle at the top is supposed to be square and the oval thing direct under it is supposed to be a circle. Share this post Link to post Share on other sites
IRobertI 428 Posted December 29, 2015 in My UMO+ will not print a perfect circle You probably have a bit of backlash caused by loose belts: http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide#circles (UM2 is pictured but it applies to your UMO as well) Share this post Link to post Share on other sites
neotko 1,355 Posted December 29, 2015 in My UMO+ will not print a perfect circle Also check and recheck the calibration. On umo+ mxl belts at some speeds it's easier to see even a small error in calibration (I mean even a half millimeter). On the long run. Print and install twisterblocks by chopmeister and if you really care about precision ditch the bad umo/umo+ mxl pulleys and upgrade to gt2 (the ones um2 uses). I changed my 3 machines to that (two on the assembly day) and it's just fantastic (slightly better but noticeable). About t gt2 upgrade on umo/umo+ https://ultimaker.com/en/community/15874-mxl-vs-gt2-print-results A better side blocks: https://www.youmagine.com/designs/twisterblocks Share this post Link to post Share on other sites
Blake215 0 Posted December 30, 2015 in My UMO+ will not print a perfect circle You probably have a bit of backlash caused by loose belts: http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide#circles (UM2 is pictured but it applies to your UMO as well) Thank you, I did what you said and it really helped. After tensioning those belts I followed the instructions on this link, http://blog.mcmelectronics.com/post/3D-printer-calibration#.VoMYr4RlngG ,to calibrate my X and Y axis and I now have perfect circles. Share this post Link to post Share on other sites
Blake215 0 Posted December 30, 2015 in My UMO+ will not print a perfect circle Also check and recheck the calibration. On umo+ mxl belts at some speeds it's easier to see even a small error in calibration (I mean even a half millimeter). On the long run. Print and install twisterblocks by chopmeister and if you really care about precision ditch the bad umo/umo+ mxl pulleys and upgrade to gt2 (the ones um2 uses). I changed my 3 machines to that (two on the assembly day) and it's just fantastic (slightly better but noticeable). About t gt2 upgrade on umo/umo+ https://ultimaker.com/en/community/15874-mxl-vs-gt2-print-results A better side blocks: https://www.youmagine.com/designs/twisterblocks That would probably be the best long term solution. That will be the next upgrade that I add to my UMO+. Thank you for the help. Share this post Link to post Share on other sites
