Melzi to Arduino/Ramps 1.4 printing issues I have a Monoprice IIIp that the Melzi board fried the connector on the bed. Replaces with the Mega 2560 and Ramps 1.4 and have it configured partially. When I print the Y axis shifts as the print continues to the upper layers of the object. Eventually the extruder gets so far out of sync that it strings the filament out. Very ugly. I suspect there are some settings in the Melzi that I have not transferred to the new board in the Marlin firmware. It seems to be primarily in the Y direction. I've attached a picture of the last attempt at printing... Here are the settings for movement: DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 100, 96 } DEFAULT_MAX_FEEDRATE { 200, 200, 2, 50 } DEFAULT_MAX_ACCELERATION { 1000, 1000, 100, 1000 } DEFAULT_ACCELERATION 1000 (X,Y,Z,E) DEFAULT_RETRACT_ACCELERATION 1000 (E retract) DEFAULT_TRAVEL_ACCELERATION 100 (X,Y,Z) DEFAULT_XJERK 20.0 DEFAULT_YJERK 20.0 DEFAULT_ZJERK 0.3 DEFAULT_EJERK 5.0 Can someone give me some idea of what needs to be done to correct this issue. Please advise and thanks... https://reprap.org/forum/read.php?1,771402,771402#msg-771402 Mon, 05 Oct 2026 11:23:41 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,771402,771402#msg-771402 Melzi to Arduino/Ramps 1.4 printing issues https://reprap.org/forum/read.php?1,771402,771402#msg-771402
When I print the Y axis shifts as the print continues to the upper layers of the object. Eventually the extruder gets so far out of sync that it strings the filament out. Very ugly.

I suspect there are some settings in the Melzi that I have not transferred to the new board in the Marlin firmware. It seems to be primarily in the Y direction. I've attached a picture of the last attempt at printing...

Here are the settings for movement:

DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 100, 96 }
DEFAULT_MAX_FEEDRATE { 200, 200, 2, 50 }
DEFAULT_MAX_ACCELERATION { 1000, 1000, 100, 1000 }

DEFAULT_ACCELERATION 1000 (X,Y,Z,E)
DEFAULT_RETRACT_ACCELERATION 1000 (E retract)
DEFAULT_TRAVEL_ACCELERATION 100 (X,Y,Z)

DEFAULT_XJERK 20.0
DEFAULT_YJERK 20.0
DEFAULT_ZJERK 0.3
DEFAULT_EJERK 5.0

Can someone give me some idea of what needs to be done to correct this issue.

Please advise and thanks...]]> Bob Frakes General Fri, 02 Jun 2017 07:42:15 -0400