I've used a cheap 3D pen to weld smaller prints together. Works pretty well. You have to be quick because once the filament starts to cool it doesn't bind well. It also doesn't look that pretty, but I only use it in areas that aren't visible in the finished product. If you're planning on sanding it after I think you'd be fine.

I'm not sure. That's the first I've heard of a fire. It's pretty easy to find in my area, but I can't speak for the rest of the country. I have noticed the price go up some in recent years, but I assumed it was from popularity and just general inflation.

Angel's Envy is one of my favorites. Runs about $45 here in the states and is relatively easy to find. I'm not sure if they export though.

I switched to Printed Solid Jessie filaments after my previous bread and butter supplier, 3D Solutech, went out of business. Jessie is been good so far for a relatively low price. I hope they continue to expand their color lineup because they're still missing a lot of shades I used previously. I'm still searching for a secondary brand to fill those gaps.