BLV MGN12 MOD Prusa MK52 Heatbed
thingiverse
I upgraded my Anet A8 by replacing all its parts with BLV's MGN12H mod, except for the heated bed. I decided to switch to a 24V heated bed and chose the convenient Prusa MK52 magnetic heatbed solution, which necessitated a new Y carriage. This is where I share the design of a sturdy carriage that fits directly on the MGN12H sleds and allows for the MK52 heatbed to be installed, also increasing printing volume (X+30mm, Y+10mm, Z+20mm). Prepare this file for CNC milling or use the .dxf for lasercutting and have someone with a machine produce it from ~3mm thick Aluminium or order online. The front right corner has 2 additional mounting holes intended for a camera holder. The Belt connector holes are not perfectly centered, but rather to the right due to replacing the original Anet A8 Y motor with a bigger/longer one. This allows longer motors to fit while allowing the belt to be attached in a straight line. To install the new heatbed carriage, you'll need to print a new Y-axis motor holder (sitting a bit lower) and a new Y-axis tensioner (also sitting a bit lower) and a new belt locker (modified files from BLV attached). Update: I found an online store that produces this item at a good price. I ordered it and will test it in a few weeks. Update: The heat bed support plate arrived, holes fit perfectly. In the process of assembling everything. Update: The heat plate is mounted. One issue occurred when mounting the Z-motor spyder couplers - they take up more z space than regular flex couplers. Without changes, the nozzle was unable to reach the bed. To solve this, I added some spacers (10mm height) between the z motors and the motor mount. Files are also included. Update June 2019: Instead of using the modified BLV Y Motor mount and tensioner, I decided to use the Idler and Motor mount from Prusa Bear upgrade. It works perfectly. I changed the orientation of the tensioner system attached to the bed carriage to use less spacer so the full bed can be used (in y direction). A small drawback is that the center screw to fix the bed is unaccessible this way, but the bed is flat and stiff enough anyway. This concludes my build, and I highly recommend it to anyone who wants to transfer their Anet A8 heatbed back into the Anet frame and upgrade to a larger, more elegant heat bed. With 24V, everything works like a charm, the bed is rock solid and heats up to 80°C in ~3-4 minutes. Recommended heatbed: MK52 heatbed, Option 2 (textured surface) Update October 2019: The textured PEI sheet from Trianglelab works fine for PETG, but not really for PLA. Instead, I suggest getting the original from Prusa, which is available now for just ~10$ more. It works really well for PLA and PETG. HeatBed spacers and mounting screws In case you cannot lower your z-motors anymore, you can raise the bed with longer spacers. You'll need longer m3 screws to fix the bed to the support plate.
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