SOLVED - Gaps in First Prints

[BennyBoyW]

Hi
Many apologies - I am a total noob to this 3D printing thing.
We have built a Geeetech Prusa i3 B and have calibrated it and printed off my first print. I have attached a photo and as it shows, there's a lot of gaps in the outside walls.
I am cheered by the fact that the angles of the hex nut look straight, but alarmed by the gaps.
What is causing this please ? There's so many settings that this might be caused by that my brain has fogged up totally.
Thanks
Ben

[JohnDeere630]

It's way under-extruding for some reason. Possible reasons in order of probability: Clogged nozzle, extruder temp. too low, slicer settings wrong, going too fast, extruder pulses per mm off in firmware (unlikely but possible).....

[William]

You can refer to JohnDeere630
Add one suggestion
You can swap the A4988 of Zaxis and extruder and then test it again

[BennyBoyW]

Solved this - it seemed to be a combination of problems including pressure from the extruder spring. A lot of Google and some trial and error (and a new batch of filament) seems to have solved the under extrusion problem. I still need to calibrate the extruder fully and I will do that tonight I think.
Thanks all for help

[erockMakes]

I'm having the same issue and no matter how hot I seem to go on the extruder temp, I still don't get full infill. What are you using for temp and feed rate?