Letter opener Improved

Letter opener improved version
1h 4m
2× print file
0.15 mm
0.40 mm
18.00 g
3
22
1
201
updated November 24, 2024

Description

PDF

The original design used a Xacto blade  (https://www.printables.com/model/432329-x-acto-letter-opener). 
The advantage is that the blade is pretty small. I wanted to use a part (3 break-off pieces) of a standard small hobby knife. (In German "Japanmesser").

My first published design I noticed that it does not work well under all circumstances because the angle of the blade is too steep. I modified the design to have a lower angle. Unfortunately to get a workable design I had to make the body longer.
I also checked out an existing commercial model I had, and copied the little “arc” that is supposed to hold the paper down.

So far it seems to work better.

I printed with an MK4S with 0.4HS Nozzle with 1.5 layer structural.

In the 3mf file I added a pause where you have to put in the blade. Be sure that the blade is down completely and oriented correctly. 
To be sure I carefully used a very small drop of superglue to hold the blade in place when the printing continues.

When you want to change the design I added the F3D files. Be aware I am not a trained mechanical designer, and designed this “by the seat of my pants”.

Have fun, and when you print and/or modify it please share your results.

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Model origin

The author remixed this model.

Differences of the remix compared to the original

Improved the design Better angle of the blade

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