X-Acto Knife (No 1) Cap

This is a replacement cap for the X-Acto No 1 Precision Knife | Z-Series. We use these in the classroom sometimes and inevitably the caps are lost, making them a safety hazard. 

It is easiest to with the closed end of the cap on the print bed with a brim. I printed in PETG but I'm guessing it would be ok in PLA as well. The flexible arms that grip the knife might be more likely to break though since PLA is more brittle.