I did leave the ink in the pen and it still worked when baked. I think if you make sure your temperature doesn’t go higher than 275, you should be fine. Out of all the pens I have baked, however, a few of them have been unwritable after baking. I have only used Bic, but I’m sure you could use others. Just test one before making a whole bunch. Thank you for your interest!
Danielle

Thanks i was wondering how do u back a pen with the ink still inside

I make all of my pens by removing only the gold part of the ink. The easiest way to do this is to detach the entire black piece with pliers, then hold it firmly with your fingers and push up on the ink. The golden tipped ink part should pop out and you’ll be left with a black shell. Slip this back into the pen and then cover and bake. Leaving the ink out is also a great way to be able to remove fingerprints or carve into your pen before baking. I slide my covered pen onto a long, thin knitting needle, and run the skin between my thumb and forefinger very quickly up and down the shaft of the pen. This removes fingerprints. Simply use the knitting needle to slip the pen onto a bedding of quilt batting or fluffy material of some kind and bake. It will come out nice and shiny!

Bake for 15 minutes