12v Heated Bed Guide for the Mega Zero v1.0 (Melzi & Mini MZ)

Ladies and Gents, This is myHeated Bed Upgrade Guide for theMega Zero v1.0!

This is in 2 parts, one for the SKR Mini MZ (the easy version) and the Advanced version for the Stock Melzi Board.

UPDATED: I've now included a compatible "PEI Spring Steel Build Plate" option. If you intend to print PETG, then I recommend the "PEI Spring Steel Build Plate", it heats up faster and is much easier to print PETG on than an Ultrabase. It's also a much easier install.

PS, I highly recommend you install a Browser extension like "Imagus" (for Firefox) as this lets you see the Images by hovering your Mouse pointer over them.

Prerequisites for both Board Types:

1/ AProper Power Supply - the Stock PSU cannot supply the required Current. The Mean Well LRS-350-12 is my recommended choice.
https://www.digikey.com.au/product-detail/en/mean-well-usa-inc/LRS-350-12/1866-3344-ND/7705030

2/**ABS Printed Bed adapter Brackets** - I got these printed out by a local 3D printing Specialist, I don't recommend using other print materials or you'll have serious issues with warping due to the radiant heat from the bed or heat transfer via metal springs.
https://mk0helpcentertej4mtv.kinstacdn.com/wp-content/uploads/2021/01/TH3D\_MegaZero\_HeatedBedBracket.zip
or
https://www.thingiverse.com/thing:4793382

3/ 4x M3 x12mm Bolts and nuts

4/ 4x Taller Bed Thumbwheels
https://www.thingiverse.com/thing:4896588

5/ AHeated bed andBuild Plate (the 220mm kit includes the glass but it's too small)
BTT Ultrabase Heated Bed Platform - 12V, 220mm Kit

BTT Ultrabase Heated Bed Glass - 235x235mm
https://www.aliexpress.com/item/32926193038.html?spm=a2g0s.9042311.0.0.6ba04c4d5Logma

OR

If you prefer aPEI Spring Steel Build Plate, you could easily swap in this part without any Issue. The Magnetic Bed base come with adhesive so you won't need the thermal tape. You stillneed the "BTT Ultrabase Heated Bed Platform - 12V, 220mm Kit".

BTT PEI Spring Steel Build Plate and magnetic base
https://www.aliexpress.com/item/1005001500335234.html?spm=a2g0s.9042311.0.0.27424c4dpf0meX

6/**0.2mm Thermal Adhesive tape**. You could use larger sheets of adhesive tape, however, they are a lot thicker @ 0.5mm (the 235mm glass does not include thermal adhesive tape).
https://www.amazon.com.au/gp/product/B07WNRL4BN/ref=ppx\_yo\_dt\_b\_asin\_image\_o06\_s00?ie=UTF8&psc=1

7/**Cable Strain Relief** for the Print bed Cabling:
https://www.thingiverse.com/thing:4793382

8/**Cable Ties** / Zip ties
Either 2.6mm wide or 3.5mm wide

9/**Cable Management Clips** (highly recommended):
https://www.thingiverse.com/thing:4144671

Bed Installation (Both Boards):

1/ Install the new Power Supply using your preferred method:
IMO rear mount is Ideal as it won’t prevent you from upgrading to Dual Z-screws.
Here are 2 ideal options:

https://www.thingiverse.com/thing:4766416
or
https://www.thingiverse.com/thing:4792529

2/ Remove old Bed by removing the leveling wheels

3/ Install Adhesive Thermal tape onto Heated Bed:
a/ Clean the Aluminium plate with Isopropyl alcohol to make sure it’s 100% clean

b/ Apply adhesive tape onto Aluminium plate - try to get each row as close to the previous row as possible without overlapping or you’ll have heat transfer issues.
https://cdn.thingiverse.com/assets/d6/47/9b/ea/d7/2021-03-12\_14.02.12.jpg
https://cdn.thingiverse.com/assets/b0/83/08/e3/1e/2021-03-12\_14.05.56.jpg

c/ trim the excess tape off with scissors
https://cdn.thingiverse.com/assets/52/a8/1a/3f/05/2021-03-12\_14.10.51.jpg

d/ Put glass plate on a flat surface upside down and clean the bottom of the Glass plate with Isopropyl alcohol to make sure it’s 100% clean
https://cdn.thingiverse.com/assets/2a/fb/86/57/74/2021-03-12\_14.14.00.jpg

e/ peel off the backing tape and very carefully place the Aluminium plate in the X & Y centre of the Glass plate. Press down firmly to ensure it goes on properly.
https://cdn.thingiverse.com/assets/f4/3c/ab/ab/4a/2021-03-12\_14.17.23.jpg
https://cdn.thingiverse.com/assets/e7/e2/55/b5/57/2021-03-12\_14.23.27.jpg
https://cdn.thingiverse.com/assets/93/c7/28/c2/bf/2021-03-12\_14.25.03.jpg
https://cdn.thingiverse.com/assets/33/ab/61/11/6d/2021-03-12\_14.25.27.jpg

4/ Install ABS Printed Bed adapter Brackets with smooth side down using the 4x M3 x12mm Bolts and nuts. I recommend putting the nuts on top as it’s easier to tighten these with your Alan Key on the bottom and hex spanner on top. Don’t tighten fully yet (do it after Bed is installed).
https://cdn.thingiverse.com/assets/51/c8/a7/f9/37/2021-03-13\_15.04.11.jpg
https://cdn.thingiverse.com/assets/9f/35/74/a4/4d/2021-03-13\_15.04.04.jpg

5/ Install Cable Management bracket onto rear Bed adapter bracket with Superglue. I found the best location was in-line with the left Y-rail.
You can do this later, but it's easier without the bed in the way.
https://cdn.thingiverse.com/assets/a3/25/49/3e/6d/2021-03-14\_10.25.35.jpg
https://cdn.thingiverse.com/assets/57/81/a3/cc/41/2021-03-14\_10.25.43.jpg

6/ Install Bed into Printer – use either Springs or Silicone Mounts and either M3 Wing-nuts or Knurled M3 Screw-nuts.
https://cdn.thingiverse.com/assets/06/1f/d3/a2/7d/2021-03-13\_15.05.35.jpg
Tighten fully the Bed Adapter fixings (ensures good alignment) and remove the protective plastic from the top of the glass bed:
https://cdn.thingiverse.com/assets/ab/8e/d3/ef/7f/2021-03-13\_15.50.37.jpg

7/ Run the heated bed cable down and under the V-rails (as shown in pics below).
https://cdn.thingiverse.com/assets/67/54/9f/f2/54/2021-03-13\_15.29.22-1.jpg
https://cdn.thingiverse.com/assets/ae/94/d7/8e/75/2021-03-13\_15.29.06.jpg

Use a zip-tie to fix the cable bundle to the Cable Strain Relief Bracket.
https://cdn.thingiverse.com/assets/8b/55/e2/00/af/2021-03-14\_11.03.52.jpg
https://cdn.thingiverse.com/assets/af/aa/29/68/f4/2021-03-14\_11.04.03.jpg

I used a Cable Management Clip and Zip-tie to fix the cables to the right side of the chassis rail. Make sure there is enough cable for the bed to move through its full range of motion.
https://cdn.thingiverse.com/assets/aa/80/ce/35/50/2021-03-14\_15.51.39.jpg
https://cdn.thingiverse.com/assets/95/cb/c2/07/5a/2021-03-13\_15.29.13.jpg

Electrical Installation (SKR Mini MZ):

1/ Install Bed wiring as per the SKR Mini MZ documentation.

2/ Install KAD Mega Zero FW
https://github.com/kad/Marlin/wiki#installing-firmware

3/ PID Autotune the Bed temps:
(use Octoprint Terminal)
M303 E-1 S60 U1

4/ Re-level the Bed while at printing Temps via which ever process you use.

5/ Enjoy your 3D Printer!
https://cdn.thingiverse.com/assets/06/a9/3d/cf/52/2021-03-13\_19.45.01.jpg

Electrical Installation (Anycubic Melzi Board)

If you aren’t competent with Soldering, just buy theSKR Mini MZ:

Items Required:
Infineon “PG-TO252-3-11” in "TO-252" format or compatible Mosfet (the external modules are a waste of time and quite unnecessary if you can solder).
https://www.digikey.com/en/products/detail/infineon-technologies/IPD25N06S4L30ATMA2/6109254
(Updated the above - I used the wrong links)

6 Pin Terminal Block
https://www.digikey.com.au/product-detail/en/amphenol-anytek/VI0601550000G/609-3931-ND/2261342

Installation:
1/ De-solder the stock 2-pin terminal from the PCB (it’s junk and they are usually installed crooked)

2/ Install an Infineon “IPD036N04L G” Mosfet onto the blank space Marked as “01”.

3/ Install 6 Pin terminal block (don’t do this before the Mosfet or you wont have much room to install the Mosfet).
https://cdn.thingiverse.com/assets/5a/a0/27/34/e7/2021-03-13\_19.11.55-1.jpg

4/ Install the wiring as per the PCB silk screen on the bottom of the board. (I took a photo so I didn’t forget).
Bed Thermistor connects to "T1".
https://cdn.thingiverse.com/assets/49/9a/d5/d9/2d/2021-02-24\_14.28.59.jpg
https://cdn.thingiverse.com/assets/f9/98/71/de/3e/2021-03-13\_19.33.27.jpg

5/ Install KAD Mega Zero FW
https://github.com/kad/Marlin/wiki#installing-firmware

6/ PID Autotune the Bed:
(use Octoprint Terminal)
M303 E-1 S60 U1

7/ Re-level the Bed while at printing Temps via which ever process you use.

8/ Enjoy your 3D Printer!
https://cdn.thingiverse.com/assets/06/a9/3d/cf/52/2021-03-13\_19.45.01.jpg

PS, a Huge Thanks goes to @Ivader for his excellent KAD Mega Zero (Marlin) Firmware, I tip my hat to you sir!

Print Settings

Printer:

Anycubic Mega Zero

Rafts:

No

Supports:

No

Resolution:

0.2

Infill:

25% Cubic

Filament: X3D Pro PLA White

Category: 3D Printers