Hi, about the little Z-axis offset, you could check this : after a print the Z-axis motors can have been released by the G-code of your print (also the X- and Y-axis motors) so one can move the carriages freely. If you can move the Printhead (X-,Y-axis) freely after a print, then it was set in the G-code. This command is set in the 'End G-code' section in the G-code of your slicer and is generally added to your every print. This means that after a print, the grip on the motors is released. With the next print the grip on the axisrod is restored. In my opinion (I could be totally wrong) this tempory 'gripless' moment may cause a small shift later when the motor grips the axis back, with a slight z-offset as a consequense. It is as if you got hold of a cup of coffee, excuse me, since you're living in Britain, a cup of tea, place it on the table and later on try to take it up the exact way you held it before, ... mission impossible. Try 'commenting out' the command line in the End-code section of the G-code, before slicing the model. I use MatterControl for slicing and the 'End G-code' section mentions the line : '; M84 ; disable MOTORS'. The ' ; ' at the beginning of the line makes that what is comming next, the 'M84' command, is NOT executed. So the motors are held tight. And the next print they hold their position. NOTE : doublecheck for the right G-code command which disable the motors, it works on my antique non-auto-leveling-prusa-clone 3D-printer with MatterControl slicer. Probably the same as mine, but in this world of versatility, you never know, do you ? In general, try not to 'dissable' or 'release' the motors, unless you have to tinker your 3D-printer of course. If you do, this little Z-shift can occur, and also the accompanioning annoyance. If you try this, please reply if it had result. It helped for me. BTW, good explanation video, good tips like the heatsink on steppers, the removal of filament residue by printing over it, and more about the hardware, smart. Thank you !
We have one in the office, and yeah, pretty much having a hard time printing with PLA, but this thing prints ABS and Nylon with no problems at all. Though i need to open the top cover and keep the temperature low for pla (190-50), any higher than that, clog.
I believe the Z axis motor (NEMA17- 42-48mm) have a compression spring in them that can cause Z offset issues due to the compression and decompression tolerances. I saw someone mention recently that those type of motors are not really designed for mounting in that Z plane, the fix being the motor re-mounted next to the Z thread and it being coupled with a belt. Alternatively could mount the motor horizontally, and run the belt in the current path of the lead screw ("single belted Z config") Another issue could be the entire bed being supported by only 2 linear rods at the rear, this will mean a lot of deflection of the front of the bed, dependant on how rigid that bed frame is
I think it is as you said the bed being supported only at two points. I have an ender 5 Plus that is rock solid and pretty much the same gear but the bed is supported at all four corners. A design fault in the CR5 for sure.
Hi, please don't you have a link to the replacement heatbreak you used instead of the nonsense they put there. I can't find a replacement that will fit the holes in the cart. Thank you very much for your answer
Hi, about the little Z-axis offset, you could check this : after a print the Z-axis motors can have been released by the G-code of your print (also the X- and Y-axis motors) so one can move the carriages freely. If you can move the Printhead (X-,Y-axis) freely after a print, then it was set in the G-code. This command is set in the 'End G-code' section in the G-code of your slicer and is generally added to your every print.
This means that after a print, the grip on the motors is released. With the next print the grip on the axisrod is restored.
In my opinion (I could be totally wrong) this tempory 'gripless' moment may cause a small shift later when the motor grips the axis back, with a slight z-offset as a consequense.
It is as if you got hold of a cup of coffee, excuse me, since you're living in Britain, a cup of tea, place it on the table and later on try to take it up the exact way you held it before, ... mission impossible.
Try 'commenting out' the command line in the End-code section of the G-code, before slicing the model. I use MatterControl for slicing and the 'End G-code' section mentions the line :
'; M84 ; disable MOTORS'.
The ' ; ' at the beginning of the line makes that what is comming next, the 'M84' command, is NOT executed. So the motors are held tight. And the next print they hold their position.
NOTE : doublecheck for the right G-code command which disable the motors, it works on my antique non-auto-leveling-prusa-clone 3D-printer with MatterControl slicer. Probably the same as mine, but in this world of versatility, you never know, do you ?
In general, try not to 'dissable' or 'release' the motors, unless you have to tinker your 3D-printer of course. If you do, this little Z-shift can occur, and also the accompanioning annoyance.
If you try this, please reply if it had result. It helped for me.
BTW, good explanation video, good tips like the heatsink on steppers, the removal of filament residue by printing over it, and more about the hardware, smart.
Thank you !
We have one in the office, and yeah, pretty much having a hard time printing with PLA, but this thing prints ABS and Nylon with no problems at all.
Though i need to open the top cover and keep the temperature low for pla (190-50), any higher than that, clog.
I believe the Z axis motor (NEMA17- 42-48mm) have a compression spring in them that can cause Z offset issues due to the compression and decompression tolerances.
I saw someone mention recently that those type of motors are not really designed for mounting in that Z plane, the fix being the motor re-mounted next to the Z thread and it being coupled with a belt.
Alternatively could mount the motor horizontally, and run the belt in the current path of the lead screw ("single belted Z config")
Another issue could be the entire bed being supported by only 2 linear rods at the rear, this will mean a lot of deflection of the front of the bed, dependant on how rigid that bed frame is
I think it is as you said the bed being supported only at two points. I have an ender 5 Plus that is rock solid and pretty much the same gear but the bed is supported at all four corners. A design fault in the CR5 for sure.
Hello, can you send the links to where you purchased the upgrades please? Thanks!
Hi, please don't you have a link to the replacement heatbreak you used instead of the nonsense they put there. I can't find a replacement that will fit the holes in the cart. Thank you very much for your answer