MK2 Heatbed for Vellemann K8400

thingiverse

My K8400 Printer from Vellemann Performs Well, But Printing ABS with BuildTak Remains a Challenge. I Decided to Upgrade with a Heatbed. Material: * MK2B Headbed 214x214mm - http://www.ebay.de/itm/Heizbett-MK2A-12V-PCB-schwarz-heated-bed-platform-build-printing-bed-RepRap-3D-/ (German Site) * Glass Plate 214x214x3mm * Extra Aluminium Plate 214x214x3mm * Thermistor 100 kOhm * AWG14 Power Wires for Heatbed 0.5m * AWG18 Wires for Thermistor 0.5m * Heat Shrink Tube for Isolating Thermistor Connections * Thermal Grease * 4 M3x15 Screws with Allen Key Head * 4 Compression Springs ID 3mm, 10mm Long - http://www.ebay.de/itm/4x-Druckfeder-5-x-7-x-1-mm-14-mm-lang-RepRap-3D-Drucker-Heizbett-Extruder-/ (German Site) * Female Dupont Socket Connector 1x4, 1x2 * 20cm Wide Kapton Tape - http://www.ebay.de/itm/200mm-Polyimide-Tape-Hitzebestandiges-Klebeband-Polyimid-Kapton-3D-Drucker-33m-/ (German Site) * Acetone * 4 Clips - http://www.ebay.de/itm/4xMaulklamme-51x20mm-Klemmweite-foldback-clamp-Stahlklammer-bulldog-clip-schwarz- (German Site) Instructions: 1. Solder AWG14 Power Wire to Heatbed. 2. Solder Normal Wire to Thermistor and Isolate with Heat Shrink Tube. 3. Attach Thermistor to Center of Heatbed and Secure with U-Shaped Soldered Wire. 4. Break Off 4 Corners of Glass as 2cm x 2cm Triangle. 5. Stick Kapton Tape Smoothly onto Glass and Clean with Acetone. 6. Unmount Vertex Metal Bed, Remove Glass, and 4 Holder Clips. 7. Offset (by 12mm) 2 Holes of Heatbed PCB to Prevent Short Circuit When Electrically Connected by Screws. 8. Copy Red Holes from Sketch onto Extra Aluminium Plate (4mm Hole). 9. Mount Rear Clip Holes of Vertex Metal Bed Firmly to Other Two Holes of Headbed. 10. Create 2 M3 Threaded Holes in Front of Vertex Bed Metalplate (2.5mm Drill Diameter). 11. Sandwich Parts: Vertex Bed, Spring, Heatbed, Thermal Grease, Alu Plate, 3mm Shrink Tube (Insulator), M3 Screw. 12. Install Whole Sandwich onto Z-Stage Again. 13. Unplug and Unmount Z Endstop. 14. Offset Mounting Holes of Z Endstop Down by 10mm. Draw Template on Cardboard for Reference. 15. Mount Z Endstop Again, Ensuring It Doesn't Collide with Z Stage. 16. Feed Cables Through Hole in Bottom and Cut to Correct Length. 17. Attach Socket Connectors to Mainboard ("Bed Heater" Pinout: + + - -; "Bed Therm" Pinout: + -). 18. Put Glass onto Extra Metal Plate and Secure with Clips. 19. Test Heatbed Regulation Function. 20. Level New Bed Carefully Using Screw on Z Stage, 3 Vertex Levelling Screws from Bottom, and 4 Allen Key Levelling Screws on Top. 21. Test Autohome, Ensuring Hotend Doesn't Run into Clips or Heatbed. 22. Done. Note: Mk2A BRD File Copied from http://reprap.org for Reference; Not Actually Used.