Klipper module for 7x7 Mesh on a Mk2s (original bed)
Hello,
i designed a 3D Printed Bit Holder for High-Resolution Heatbed Scanning, you can find it here: https://github.com/Mithrandil/PINDA-bit
This is a simple and useful accessory for Prusa MK2 and MK2S 3D printers (or other printers with an inductive probe). It is a plastic tube that holds a screwdriver bit and allows you to scan the MK42 heatbed with the P.I.N.D.A sensor. This way, you can level the bed for non-magnetic or off-magnet print surfaces.
The advantage of using this accessory is that you can perform finer mesh bed leveling with a 7x7 grid or any arbitrary resolution. This can improve the first layer quality and adhesion on uneven or warped beds. Moreover, since the shape of the MK42 heatbed depends only on the temperature and is consistent between prints, you don't need to scan the bed every time you change the print surface, as long as you use the same temperature. You can also save different presets of the bed mesh for different temperatures and recall them when needed.
However, to scan a print surface that is outside of the magnet points, you need to use custom firmware such as Klipper. You can find an MK2s config here: https://github.com/Mithrandil/klipper-config-prusa-mk2s
In this repository, you will find a module that corrects the tilt of the X-axis before each print. This is necessary because the position of the Z-axis motors is not preserved between prints when they are not powered. Therefore, if you use this accessory to scan a non-magnetic print surface, you need to run this module before printing to ensure a level bed.