Anet A8 Double Heat Bed (220x440x220)

thingiverse

It seems like you're describing the process of building a custom heat bed carrier for a 3D printer. Here are some key points from what you've shared: 1. **I-Typ Profile Length**: Your i-typ profile is about 84 cm in length, which means you'll need to create front holders by yourself since they depend on the length of your i-typ profiles. 2. **Silver Steel Rods and VA Screws**: You have silver steel rods that are 77cm long and VA screws that are 82 cm (though not cut yet). These components will play a crucial role in the heat bed carrier's structure. 3. **Heat Bed Carrier Construction**: - Use the old heat bed carrier as a template to mark holes on new alloy or carbon material for the linear bearings' middle bearing holes and four bearings. - Create space between the linear bearing and the heat bed carrier by placing 2cm linear bearing spacers. This is to accommodate the i-typ profile. - Place i-typ profile spacers at 1/4 and 3/4 of travel way. - Add the i-typ profile on the spacers with top/back acryl plates, ensuring there's about 1mm space between bearing blocks and the profile. - Use the sleds in the middle of the carrier. If they're too low, use thick paper (sandpaper side facing the sled) for adjustment. 4. **Sled Placement and Additional Profile Holders**: Place the sleds before assembling the heat bed carrier as it might be challenging later with spacers. Add additional i-typ profile holders at the back using 8mm steel rod holder screws to prevent the i-typ profiles from sliding backwards. Use spare part holders for this. 5. **Spacers and Profile Alignment**: Create spacers to prevent bending and keep the i-typ profiles parallel. This is essential for arranging the i-typ profiles easily between the linear bearings. 6. **Plane Surface for Heat Bed Mounting**: Suggest using additional plates where you'll screw the heat bed onto, preferably with material that can be printed directly on it or alloy for a flat surface without any edge protruding from one heat bed. Use 35-40mm screws to make knurled nuts easier to get on. 7. **Carrier Assembly and Leveling**: Assemble the carrier similar to the old one but level it differently, using some knurled nut or cutting an M3 thread into the alloy (though this might not be possible with carbon). This allows for six points of leveling for the heat bed. 8. **Electric Components**: - Use 3 MOSFETs for separate heating control. - Utilize ATX power supply with 60A double rail, allowing separation of one heat bed to each rail and other components. 9. **Safety Note**: Solder wires directly on the bed; avoid using a plug that can cause fire due to overheating. 10. **Firmware**: - Use Skynet firmware compatible with Arduino 1.0 board and Ramps 1.4 board. - For diamond hotend, use a Ramps 1.4 with CNC shield. 11. **Configuring Firmware**: In Configuration.h, change the Y_MAX_POS to reflect your heat bed's length (440mm in this case) for correct double Y axis operation.