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I am using everything stock, inc settings (except for calibration) for my Rostock v2

I am printing with pla.

Am I correct that this is under extrusion? Or could there be another cause?

Good morning! I am no where near as experienced as most of the people that frequent this forum but it looks as though your Z Height is high. I would try redoing your z height and see if the problem continues.

I agree the extrusion is to high. However, when I do the calibration, I used a .009 slider and brought it down till the hot end was barely touching. I also did the alternate calibration and at all three points it barely touches the hot end.

However, when I go to print it seems like it starts higher that it should. I noticed that I have automation technology steppers, so I went in to make the voltage change, but now the z axis only goes down half as much as the other two once a print starts (they all go down fine in the z calibration menu) so I need to figure out what is going on there. (I think maybe I put 15 instead of 150 on the z axis and now it is skipping steps). I was on my way to work so I didn't have time to investigate fully.

Here is a topic i have posted on before that towards the bottom user nitewatchman gives information about using a feeler gauge to calibrate z height. from my understanding, when you go to print the gcode has the z height start at .2mm from the 0 z height. Give this topic a read (http://forum.seemecnc.com/viewtopic.php?f=37&t=9632) towards the bottom nitewatchman talks about the feeler gauge so it may help you.

Thanks for your post buggy! It is great that younger members of the forum are helping other members. Just as it is supposed to work.
Thanks again!

So I figured out a few things.

The calibrations I was doing weren't holding because I had inadequate belt holding power (and tension).

When I installed the belts on the machine, I had the belts come out at the center of both clips instead of folding them over. I do not know why I did that. Maybe because that's how my Prussa did it. It makes so much more since to do it the way the instructions say, and fold them over. I recalibrate do my machine, but I ran out of time to get it perfect, so atm I think the nozzle is a bit low.

Atleast the belt tension is correct.

Well when you fold them over, then the clip actually holds the belt.

g.

Does anyone weigh their prints after completion to assess under/over extrusion? We have 3 rostock Max machines (two V2 and one V3) and while many of the final products pass the eye test some of the prints are coming out 40% under the weight that is being predicted with our slicer (Simplify3D). Even when upping the extrusion multiplier all the way to 200% we are coming out 10-20% below the predicted weight. If we use the same slicer parameters for all 3 machines we will get 3 different weights of the final print, leading me to believe that this is a hardware (and not slicer) issue. Any advice you have would be greatly appreciated.
-Tyler

I printed a calibration cube (single wall) on each of my printers and measured them to get the extrusion multiplier right. Once I did the final weight of my print was within 1% of what Cura was telling me it'd be.

Try printing this (http://repables.com/r/184/) and measuring the walls w/ a calipers and see what's going on.

Okay, so I am within 5% of the projected weight (sliced by Simplify3D) when I print this "cube". I printed once solid, once at 0% infill, and once at 35% with 3 perimeters, tops, and bottoms. Each trial was about 5% below which is definitely an improvement. This relative success is for a flow rate of 100% so I suspect that I could get the desired weight by dialing this up. Still leaves me wondering what is going to happen when I go back to printing some of the very large objects (average is 600g and 12 hr print) that we provide on our Rostock machines. Perhaps I am seeing the underextrusion get worse with large objects because the extrusion is 'slowing down' towards the top of the print? Has any one seen the bowden have averse effects like this once the build gets over 100mm? Most of our prints are 200-300mm tall. Thank you for your help!
-Tyler

Please see previous post. Am I way off base? We've also noticed that increasing the layer height has an averse effect on final print weight. Printing at a default speed of 2400-3000 mm/min with 80% underspeed (Simplify3D), should it be an issue to have layer heights around .3mm on a .7mm nozzle? We were always told half the nozzle diameter is the basic rule of thumb when it comes to layer heights. Do we need a better power supply to extrude this much mass for our prints? Thanks for any and all input because we have been stumped on this one for months!