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Simple Letter/Box Opener – 3D printable model from MakerWorld MakerWorld
Hand Tools

Simple Letter/Box Opener

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Simple letter/box opener design. The pictured one is the (printed) stl file. The revised file was not printed, but should work just as well. It is about half the thickness on the blade and half the thickness on the handle when compared to the original (printed) design. Printed with generic purple PETG. Used variable infill to make the blade 100% and the handle 15%. Used variable layer height to make the first half of the knife at 0.07 layer height and the rest at 0.24 layer height. No support was necessary. Took about 8.5 hours.
Category
Hand Tools
Source
MakerWorld
Published
Updated
What you need to print this: Beginner Medium confidence
Why?
no supports
Support-free Single piece
Supports 0/3
Assembly 0/3
Settings 1/3
Bed size 0/3
Post-process 0/3
Printer
FDM / FFF
File format
STL
Material
PETG
Est. print time
8.5 h
Software
Cura, PrusaSlicer, or similar
Same designer, more platforms

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Frequently Asked Questions
Does Simple Letter/Box Opener need supports when printing?
No supports needed for Simple Letter/Box Opener — it's designed to print clean off the bed.
How long does it take to print Simple Letter/Box Opener?
According to the design notes, Simple Letter/Box Opener takes approximately 8.5 hours to print at standard settings (0.2 mm layer height, 15% infill). Actual print time varies based on your printer speed, layer height, and infill density.
What file format is Simple Letter/Box Opener available in?
Simple Letter/Box Opener is available in STL format. These files can be opened and sliced using free software such as Cura, PrusaSlicer, Bambu Studio, or OrcaSlicer for FDM printing, or ChiTuBox and Lychee Slicer for resin printing. The download is provided through MakerWorld.
Is Simple Letter/Box Opener free to download?
Yes, Simple Letter/Box Opener is available as a free download through MakerWorld. Always check the license on the original platform to understand commercial use, remixing, and attribution requirements.
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