I am having issues with my rigidbot not making a solid surface - has small missing gaps of plastic in random places.
Right on the first layer of a print, i can see gaps in the base which correlate to seeing the filament "bounce" up/down from the extruder.
I adjusted the E-pot in every way conceivable and can't fix this problem. I've tried printing at 200, 205, and 210c. I've disassembled the extruder/hot-end, cleaned it all out and re-assembled. I'm currently printing at 80mm/s (but have bottom layer set to 20mm/s in cura).
I disconnected the e-stepper from the hot-end, put in filament, and brought the hot-end up to 205c. i adjusted the e-pot until the motor was pushing the filament reliably. Then I powered down, reconnected the stepper to the hot-end and ran a test print through. I had to increase the e-pot for the extruder to push the filament at all, but still saw random "bounces". So I increased the pot 1/8 (ccw) and tried again -- saw the "bounce", increased 1/8, saw the "bounce", ... all the way until the e-pot maximum.
I also ran the extrusion test (marking 150mm and telling the printer to extrude 100mm). The printer did extrude 98mm twice in a row. That seems fine to me, so i didn't adjust the firmware. I do wonder if i try to push 1000mm if i'll see the issue, but I don't think that'd be a valid test anyway.
is the e-pot more sensitive than i'm giving it credit for ? should i be moving in 1/16 turns instead of 1/8 ? everything i read online refers to 1/4 so i would imagine 1/8 is fine. is there a better way to check the e-pot than running a test print through and just watching for errors ?
Not sure what to do or what to check. Suggestions?