OTF Nano Benchmark Challenge Over-Engineered

It is recommended to use the latest enhanced version below, which provides better style and handling. After this challenge, you will know which filament is good and which filament will cause you trouble.This model is both a benchmark and a challenge. Don't expect it to work immediately. The error tolerance is very low. A good print OTF can be triggered quickly and softly.If you decide to print it, make sure to print it few times with different filaments before giving it a low rating! If in doubt, do not print. Go for other simple models that can give you peace of mind. If you do print this, make sure you have an adequate skill level and don't give a low rating.Have a knife day! Branched from Over-engineered OTF into Nano version. Kind of benchmark test your printer. Good for benchmark test, box opener or in your key chain. Also very nice as a gift!Lots of patterns. Fully 3D printed. Upgradeable. (This is a over-engineered model. Please a