I have changed my mind a few times about how I plan to finish off my Prusa i3 MK2 clone 3D printer… but now I have settled on a plan! None of it was particularly complicated, but I just want to arrange things in such a way that they are safe, tidy and give me the best result.
As I plan to add a physical brace to the Z Axis frame, I want to combine that with a suitable housing for all the electronics. With the actual brace made I can start finishing off the electronics!!!
There are few items I want to do:-
- Fix the issues with LCD corruption – presumably cause by electrical noise
- Remove the Polyfuses and provide alternative
- Integrate the Raspberry Pi in with the other electronics so it is a permanent feature on the printer, including power
- Add in additional temp sensors to the electronics and power supplies that will kill the power if anything looks dodgy
- Power the Heated Bed with 24V instead of 12V – but keep this 24V separate from the RAMPS board
The last of these is the item I am doing first – and it the subject of this video.
The links I discuss in the video are:
Below is my rough schematic showing how I will wire the RAMPS, Arduino and also a small external board that will perform the heated bed power switching. Beneath that the calculations I made to conclude that the AUIRFB8409 Mosfet would work fine: