GUN - Gravity Utility Knife V1.1

Inspired by the Reate Exo-U i did my own attempt on a grivity knife.

This might be work in progress, so possible that there will be further versions. My original Design is for use with M2x2 heat inserts, but i also added a version for M2 nuts (untested)

Prints without any support.

For the stopper of the bladeholder its possible to use a M2x4 heat insert instead of 2x M2x2. All holes facing the buildplate but dont touch it having a 0.2mm layer to bridge the hole before printing on it. These has to be drilled/cut out afterwards.

Recommended to print with strong material. Printed mine with PETG-CF. Handle parts printing upright. Inner handle facing bottom to buildplate, outer handle facing top to buildplate

Use at your own risk! I'm not responsible if you hurt yourself with this. STEP included, feel free to remix.

Update V1.1: Added some BladeCover and also a BladeHolder with a longer cutting edge. Rest of the parts are the same. Update 16.06.24: Just added some short instruction for assembly.

BOM: - Heat Insert Version - 6x/7x M2x2(L)x3(OD) or 4x/5x M2(L)x2(OD) + 1x M2x4(L)x4(OD) Heat Inserts like this one: https://de.aliexpress.com/item/1005006071488810.html 1x M2x14 Screw 3x M2x5 or M2x4 Screw 2x M2x3 Cylinder Head Screw - Nut Version - 5x/6x M2 Nut 1x M2x14 Screw 1x M2x12 Screw 1x M2x5 or M2x4 Screw 2x M2x3 Cylinder Head Screw

Instructions:

Parts you need to print: - 1x InnerHandle - 1x OuterHandle - 1x HandleTube - 1x Button You have to choose if you want the M2x5 Version or the M2x4. Original design is the x5 - 1x LockBlock - 1x Bladeholder There are different Versions – Bladholder.stl/.obj is the classic one, which you can also use without the Bladecover BladeHolderV2.stl/.obj has a third Screw for the Bladecover. Bladeholder-Long-Edge.stl/.obj is like the V2, but with a longer cutting edge of the blade. - 1x BladeCover There are different Versions, corresponding to the choosen BladeHolder. Each of them also as “clean” Version without the “GUN” imprint. - 2x SlideStopper Here you can choose again between M2x4 or M2x5 for the heat insert version. For nut version you need 1x M2x5 and 1x M2x12_Nut

Assembly:

The parts with holes facing the buildplate but dont touch it have a 0.2mm layer for bridging the hole. This has to be drilled or removed in some other way first. But this is only the case for all versions of the BladHolder and the LockBlock_Nut.stl/.obj

After that, if you printed the heat insert version, you have to insert them now. - 1x M2x2 for the OuterHandle - 1x M2x2 for the LockBlock - 4x M2x2 for the classic Bladeholder or 5x M2x2 for V2 and Long_Edge You can also replace those 2x M2x2 hert insert for screwing in the SliderStoppers with 1x M2x4

Put the parts together: - Insert the LockBlock to the slot from the inside of the OuterHandle and screw the button to it. - Insert the HandleTube in the hole in the bottom of the InnerHandle - Slide the InnerHandle and OuterHandle together and insert the screw at the bottom. This might need a bit of force, because there are some extrusions to the inside of the InnerHandle to prevent it from opening more then needed. Also make sure the lock is in open position. - Open the Handle, insert the BladeHolder and screw the SlideStopper to it. - Now you just have to screw the Blade and BladeCover to it.