Will this work with triangular-shaped regular size pencils?

I tried it on some triangular shaped Faber-Castell colored pencils and it didn't really work that well. The blade got caught on the corners.

Does this sharpener work for multiple pencil sizes- in particular the larger size for more beginning writers?

Not the one that I have. The opening is just for the standard size pencil.

Does this sharpen Prismacolor Premier pencils well?

Well, contrary to another answer....I don't have a problem sharpening my Prismacolor Premier. The Derwent coloursoft is a tight fit (it's thicker than prisma), but it will work. Derwent Inktense, Faber Castell polychormos, Irojeten all sharpen just fine. You do of course have to check the pencil after a few twists so you don't just sharpen the lead away.

ASIN	B00IDVE9UA
Best Sellers Rank	#22,549 in Office Products ( See Top 100 in Office Products ) #123 in Pencil Sharpeners
Brand	Bostitch
Color	Assorted
Customer Reviews	4.6 4.6 out of 5 stars (14,192)
Date First Available	2 March 2014
Ink Color	Multicolored
Item Weight	4.54 g
Manufacturer	Amax Inc.
Manufacturer Part Number	PS1-ADJ
Material Type	Alloy Steel
Model number	PS1-ADJ
Number of Items	6
Product Dimensions	3 x 8.99 x 14 cm; 4.54 g
Shape	Other
Size	1 Pack

Bostitch Office Twist-n-Sharp Pencil Sharpener, for Kids & Colored Pencils, Assorted Colors (PS1-ADJ)

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