Ok, well lesson learned, if tip scratches the aluminium bed hard, replace the tip before troubleshooting for hours failed prints…
If it makes you feel better, I have ruined tips like that too! A little Scotchbrite on the bed will help reduce the scratches on the bed, but the tip is probably toast. However, if you have a larger drill you might drill it out to make a larger nozzle which is trendy right now. So drill a .4 out to a .65 etc. Really good for T-glase to make more clear.
Interesting, was always thinking the smaller the tip hole the better.
@Andre_Courchesne1 Depends on what you want. For fine detail yes. For fast prints, no. And things like T-Glase and some other “water clear” plastic, the fatter the thread the more clear it will appear–at least in a single layer like with a vase. You can’t get really clear, but you can make it more clear (e.g., translucent) by pushing fatter threads.
A few things to read: http://snip.ly/1CKu - Article on Taulman site about optical and “fat threads”
E3D’s blog about Volcano their “large tip” hot end: http://snip.ly/1CKu