Why is my 3D printer over extruding when I have set the flow rate very low Hello I am using Cura to slice my prints, and despite turning the flow rate to the minimum value of 5%, my prints are still hugely over extruding. 

I have calibrated the extruder stepper perfectly, using Pronterface, so I do not understand why this is occurring. I have also timed how long it took to extrude a certain length and compared it to the length of time it was meant to extrude and it was exactly the same. Therefore, I have concluded it is not a problem with the calibration of the stepper.  

So, I think there is a problem with the settings on Cura. Orginally, I had the flow rate at 100% and this was really, really terrible. Then I turned it down as far as possible and the print got better but there was still over extrusion. I can't down it down any further. 

I can not figure out what the problem could possibly be and as you would imagine it is very, very frustrating.

Here is the print profile:


Edit - Some extra information

So the printer is not of any model, as it is homemade CD drive 3D printer. It shares many similarities with the Curiosity3D printer, so if you want more information on how it works, then their website will be of much value.
Link

The extruder is a bowden style one. It uses a cheap e3d hotend Link to amazon and a RepRap extruder kit as the motor Link to amazon. 

Here are the Machine settings:



This is a photo of two failed prints. On the left is a G and on the right is a heart. 


This is what it was the G was meant to look like:



Edit 2 - More information

So here is a link to the configuration.h file which I previously modified for my 3D printer.Dropbox link

Also the filament I use is "Robox PLA SmartReel Cornflower Blue" link

Any help would be much appreciated.
First of all: Can you tell us, what kind of printer do you use and which material? Please give us some pictures of some prints as well.. Also the type of the Extruder setup is relevant. Is it a Bowden or Direct Driven extruder?

For an FDM machine like the Prusa styled printers with PLA:


Flow of 5&nbsp;% is totally wrong, normally PLA should be run between 90&nbsp;% and 105&nbsp;% flawlessly. The problem is elsewhere but not with the Flow settings, nor the Temp is the faulty one.


Temp between 185&nbsp;°C and 210&nbsp;°C should be fine for most PLAs
Did you set up your printer correct in Cura (Preferences -> Printers -> Machine Settings)? Material Diameter, Nozzle size and G-Code flavour are correct?



If you give us some more information, I will be glad to get this solved.