So I got my reprap up and running. I am using a direct drive setup. I calibrated the extrusion rate with a starting value of 250 and found that 245 would extrude 98 to 101 mm when told to extrude 100. That was yesterday. Today I seem to be getting all kinds of weird extrusion rates. With tension, temperature, and e-step settings the same, I tell the printer to extrude 100 mm, and I have gotten values ranging from 30 to 80 mm.
My assumption going into this was that once the tension is strong enough for the gear to grip the filament, I would get consistent extrusion rates. I could then adjust the e-steps to get accurate rates. But I seem to be unable to extrude filament at a constant rate. The effect is causing my test prints to have some layers that are under extruded and some over. I had plenty of slack in the filament during all tests.