SnakeOilXY-3S

Entry level, low cost mod for Kingroon KP3S 3D printer.

1. Introduction

Kingroon KP3S is a nice small printer, but it comes with some mechanical design problems. This mod is aiming at fixing there problem with the lowest cost as possible.

*This mod is for people already bought the KP3/S. DO NOT buy the KP3/S just because of this mod. There are many better printers you can build with the same price. For example The Tic-Tac

*This mod is designed by measuring the real hardware of the first revision of the KP3(the model with Creality style direct red extruder). Some parts might need some minnor modify to fit other revisons of the machine.

2. The problems and solutions

2.1. X and Y axis

• There is no proper way to adjust the belt tension of X and Y axis
• The belt path is not straight. This will affect the printed part dimension based on where it printed on the build place, special on large model.

• This mod added belt tensioner for X and Y axis.
• Change the belt mounting method to make the belt path straight.(check image bellow, this method apply for both X and Y belt).
• All motor shafts are supported by bearing.
• You will need new belts for XY tensioner mod since the belt path is a little longer than the original design. If not using my toolhead, you might need to your toolhead mounter to get full X movement.

2.2. Z axis

• On some revisions of KP3/S the Z motor center and leadscrew nut are not well aligned. This will make the leadscew wobble and result in Z banding problem.
• This mod added Oldham coupler and Position adjustable top support bearing.
• Position adjustable top support bearing will allow to fine-adjust the leadscrew position so it parallel to the Z v-slot extrusion.
• Oldham coulper will deal with axial and angular misalignments of the leadscew nut.

2.3. E axis (optional)

• There is no problem with the original extruder except it too heavy for the unsupported gantry.
• This mod added 2 options for lighter extruder: Direct drive Sherpa mini mount and bowden extruder mount.
• The above extruder mounters can be use with V6 hotend or any other hotend using the same mounting method(Dragon hotend with groove adapter for example).
• Optional mounting slot for BLtouch/3Dtouch
• Compatible with bear_extruder_and_x_axis fan duct and other 3rd party ducts like RH_Dreambox's Air nozzle for the Bear extruder (Rev.1) or MajorOCD's Fan Duct for Bear Extruder

2.4. Klipper config

• will be added soon

3. Bill of materials

4. How to print parts

• PETG, ABS or PC filament depend on your budget and how hot you will run the printer.
• 0,4mm nozzle, 0.2mm layer height, 5 walls, 30% infill
• Oldham coupler will need to be printed with small layer height(0.05~0.1mm) and small diameter nozzle(~0.25mm) if possible. This parts will need some sanding to make the mating surface smooth enough.

5. Copyright Notice

• Sherpa mini extruder is an original work of Annex Engineering, modified parts using their source code/design files are re-released under ANNEX Engineering License.
• bear_extruder_and_x_axis is an original work of Grégoire Saunier, modified parts using their source code/design files are re-released under GNU General Public License v3.0
• The CAD assembly using Kingroon KP3/S model of Fukuma Yohei at Thingiverse - Kingroon KP3S full assembly STP/OBJ data under Creative Commons - Attribution license
• This printer design(SnakeOilXY-3S), it's document and software are released under GNU General Public License v3.0