OTF Pro Trapezoid & 18mm Utility Blade O-Eng'ed

OTF Pro Mini 9mm snap-off blade.

OTF Original

OTF 18mm snap-off blade or Trapezoid.

OTF NANO 9mm snap-off blade or x-acto no11.

This accurate model requires printing using the most reliable filament and printer settings. Good as a benchmark testing your machine and filament setup. If you are confident in your settings, you may want to try changing the filament. But you can also try the spring kit profile. This will, to some extent, force the overturning of certain errors. Please let me know the results. Good luck.

The main problem is warping: The front cut out becomes smaller. The blade failed to catch the spring for ejection. 

Filament issues: The push lever is difficult to move(a common problem with silky), or if the parts need to sanded, this means you need to try a different filament colors/types. 

Installation issues:  The latch lever is oriented in a "V" shape, not an "A" shape. Pull the blade all the way out (reference time 00:50 in the video) and the latch lever will prevent it from returning. Now you can install the top cover.

Trapezoid based on these brands (Stanley/Hart/DeWALT/Husky/Toughbuilt). Some brands need the smaller dowel blade holder (different print profile)

(Don't blame a model or print profile by giving a low rating. It won't help you to be successful with your next print at all!)

Based on the review feedback, you'll definitely want to print more than one to show off. So consider using monochrome printing and then mixing the parts. Save both times and materials.