Did you have any issues with the secondary extruder? I have the same printer as you but the second extruder step setting is way off and looking for some insight.NotMe999 wrote:I worked on getting dual extrusion ...
Share your hardware improvements for your HIC i3, the good and the bad!
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- Joined: March 28th, 2016, 12:14 am
- 3D Printer(s): HICTOP Prusa i3 with Auto-leveling
I'm not quite certain what you mean by the second extruder step setting. Unless I missed something, there's only one step setting for both extruders.JoelR,
Did you have any issues with the secondary extruder? I have the same printer as you but the second extruder step setting is way off and looking for some insight.
I bought two new stepper motors for the extruders (so they would match), and then had to change the rate to get 100 mm of filament for a command of 100 mm. They did not not feed the same as the one that came with the printer, and I'm not using that motor right now.
With the older version of Cura (I haven't used Slic3r, so I'm not sure about it), there is a setting for the offset of the extruder nozzles, but the same setting is available in the Marlin firmware. Don't set both of them, only one. Otherwise, you end up doubling the offset. Made that mistake first, and ended up with the two dual extrusion test crosses offset when they print.
A number of changes to the firmware for the dual extrusion and the PID settings for the hot ends. I'm still working on some fine tuning, but I've manged to get some acceptable prints out of it.
If you can be a little more specific, I might be able to help more.
I bought a new stepper motor to add dual extrusion. I placed the new motor at ext0 and the original at ext1. Maintained the gear drive configuraton from stock with the addition of all metal framework. I did not change any settings in Marlin as to the step count from what I configured with the original. Ext0, feeds correctly. Ext1 feeds at about double the rate - through the LCD panel, telling it to extrude 20mm of filament extrudes 40mm of filament. Printing dual extrusion tests produces heaps of skipping do to feeding too fast. I've upgrade the x-axis stepper to a bigger stepper so maybe I'll try putting that in ext0 and see if it reacts the same way since they would be a compatible pair. But it makes no sense why it is extruding at twice the rate when the problem extruder was the one originally used to configure the extrusion rate.
Well, now it seems to have settled down. Not sure why or what happened. Only issue I am having now is too large of a retraction with PETG pulling the filament out of the hot end and getting stuck trying to push it back in (e3d clone with a reprap all-metal heatbreak), but that is one I can tackle myself.
Well, need to step that back a bit. The original change did not work as expected. I had to undo the customization of the planner.cpp and only include a single E value for steps. The guide I had followed to inject a 5th element into the array and actually use it was old and the current code reworked to the point that the customization did something entirely different. After resetting everything, I am printing with proper extrusion. Polished up the heat break of the clone and coned the PTFE tube for a better fit and the extraction issue is fixed as well. Just need to print out a new hot-end mount that allows me to adjust the height of the second hot end to put it in alignment with the first and replace the original bearings for the carriage as all but a few of the threads are stripped. Need to find some better quality bearings or an alternative mount that will allow me to use supported rods.
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