Anycubic Kossel Linear Plus upgrade BTT SKR 1.3, BTT TMC2209,, BTT TFT24, (BTTTFT35, BTT TFT35 E3 V3.0)

thingiverse

I made a few changes to the cooling cover, lowering its height by making it more compact. The fan throat was tilted at an angle, allowing for better airflow. I revised the STL files for printing orientation, added a TFT24 holder mount, and included a PSU holder 2. However, I had to drill two M4 threads into the PSU box's black cover bottom. I also updated firmware.bin and config marlin files, making some minor adjustments like reorienting the rotating encoder. This allows users to connect LCD displays in EXP1, EXP2 mode or serial connector. I added a PSU holder because it was previously held by only two screws. I included config files for 2.0.x bugfix Marlin and uploaded them along with the whole Marlin directory in a zip file. Remember to change the chip in platformio.io file to LPC1768, and copy my build firmware.bin onto the SKR board's SD card for automatic loading. I upgraded to a 32-bit Bigtreetech SKR 1.3 board, new stepper motor drivers TMC2209 from Bigtreetech v1.2, and TFT graphic display TFT35 E3 v3.0. The case for the display is still in development; check back later for updates. My goal is to fully cover the electronic board, achieve perfect forced cooling using a 40x40x10 mm fan, and especially drivers where I designed four special cooling tunnels. Air enters the box from outside through inlets on the sides, flowing above the board, then through tunnels with heatsinks attached. The fan doesn't need to be powerful since the cooling system is very efficient. To put the board far from the heatbed, I added legs to raise the whole printer. The legs require rubber feet at least 5 mm or better 10 mm of foam rubber for proper mounting of the PSU on the side, tilted. This makes space for a box with the board in the lowest position, ensuring cold fresh air from below all the time. I recommend using PLA as it's stiff enough for this project. I used mostly M3 screws of various lengths: 2x M3x20 mm, 4x M3x15 (16) mm, 2x M5x10 mm with M5 T nuts in the profile slot, and 2x M5x15 mm with M5 T nuts in the profile slot. For cables, I need longer ones from endstop microswitches, especially Z and Y. Additionally, I had to rotate the stepper motor Z by 90° so the cable socket faces down, allowing for original cables on motors. I put the power supply at the back side, tilted downward, with enough cables for the boards' connections. The PSU holder is original and fits perfectly. I soldered NSG cable connectors onto the board because I didn't order JST connectors in advance, but this isn't necessary. I printed things using PLA as it's stiff enough, and the box temperature is low anyway. Therefore, a more temperature-resistant material for case and holders wasn't needed. The project is still under development, particularly the display box.