MTM ACR4-18 Double Decker w/ HP Common Slot Power Supply


With space for the hot HP Common Slot Power supplies and a full size top you can fit tons of equipment on this mounting kit

Nice and Compact + Tons of power, this little enclosure is a great balance. Featuring 1 HP Common Stack Power supplies and a full size top plate, this double decker design can fit it all.


  • Fits 1 HP Common Slot Server Power Supply
  • Easy remove power supply design allows for power supply swaps without removing the bottom plate.
  • Double decker component deck allows for tons of components
  • Fully customizable component holes using the JDeation Designer
  • Perfectly matched to mount to a MTM ACR4-18 Enclosure
  • Top plate has wire access on 3 sides sides
  • Bottom Plate Dimensions: 12.7in x 8.6in

Works With (Sold Seperately)

Featured Variations - Customize & Download

DIY / Assembly Instructions

Assembly instructions for - MTM ACR4-18 Double Decker w/ HP Power

Please read these instructions fully and carefully before beginning your assembly. A little bit of learning and planning can make the difference between a easy great assembly and a hard mistake prone assembly.

The following assembly instructions contain both design specific and general assembly instruction which may not be specific to your design.

1) Design Your Mounting Kit Hide

All of the JDeation designs are customizable using the JDeation Designer

View our detailed walkthrough video for instructions on how to use the JDeation Designer

2) Gather Required Hardware Hide

The following pieces of hardware are required for assembly of Mounting Plate.

Most parts are available at home depot - all are available online.

  • Qty: 12 - 4-40 Standoff
  • Qty: 12 - 4-40 K Lock Nut
  • Qty: 12 - 4-40 PCB Screw
  • Qty: 20 - #8 Washer
  • Qty: 16 - #8 K Lock Nut
  • Qty: 4 - #6 Self Tapping 1/2 in
  • Qty: 4 - #8 3 in Bolt
  • Qty: 4 - #8 4 in Bolt
  • Qty: 4 - 3 in Spacer

Our Kits Make it Easy

Kits include acrylic, hardware and power supply brackets. Cheaper than you can buy at big box stores.

* example image only
Buy Full Kit - $37.00

3) Fabricate Mounting Plates Hide

Our Kits Make it Easy

Kits include acrylic, hardware and power supply brackets. Cheaper than you can buy at big box stores.

* example image only
Buy Full Kit - $37.00

The following plate fabrication instructions serve are general documentation for all mounting plate designs.

Step 1:

Acquire material to make your plates. Plastic or wood are good choices. The bellow instructions use 5mm plywood which was purchased from a local home depot. The material you choose MUST be 5mm or less in thickness.

Step 2:

Print your design on your home paper printer to scale.

On your design, click the download button and select PDF (Print). You must open the PDF in Adobe Reader to get the advanced print functions. Do not open the PDF in your browser. From the Adobe Reader print dialog box, select the following options.

Image of design printed to scale:

Step 3:

Cut and Tape your designs together. Use the Adobe cross marks to align paper perfectly. It is important to spend time on this step and get alignment correct as a misaligned tape job will interfere with hole placements on layout.

Step 4:

Apply Gluestick to back of paper. We have had good success with repositionable glue sticks.

Step 5:

Apply paper design to wood. Line up two edges of design with two edges of wood if possible to reduce cutting.

Step 6:

Drill the black circles on the design. The following size drill bits are recommended. Also while not necessary it is recommended to use a brad point drill bit as it allows greater precision due to its sharp point on tip.

Screw Size Drill Size Typical uses
4/40 1/8" Component standoffs
#6 5/32" Self tapping screws for mounting to enclosure
#8 3/16" 3" and 4" Bolts for P.S. and Shelves
#10 7/32" 6" Bolts for P.S. and Shelves

NOTE: All Black lines on design are cut or drill lines. Red lines are just for helping create the design and for information useful to assembly.

Step 7:

Use a Jig Saw to cut out the straight black lines.

4) Fabricate Power Supply Brackets Hide

The are 2 options for creating the necessary power supply brackets:

Option 1: 3D Print the Brackets

The best DIY option is to 3D print your brackets. Download the STL designs from Thingiverse.

3D Print JDeation Mounting Bracket - Thingiverse

Option 2: Cut Mounting Brackets from Wood

Making from wood is a doable option but the small components make this the most difficult option. We recommend using a band saw with a fine tooth blade for these smaller parts.

Download Mounting Bracket Cut Template

Our Kits Make it Easy

Kits include acrylic, hardware and power supply brackets. Cheaper than you can buy at big box stores.

* example image only
Buy Full Kit - $37.00

5) General Double Decker Assembly Instructions Hide

View our detailed walkthrough video for instructions on how to assemble a JDeation Design

The following assembly instructions are for the easy remove power supply design, but also currently serve as the general documentation for all other less complex builds. For general builds, please alter instructions by skipping unnecessary steps.

The actual design shown is the MTMACR8-72 Easy Remove.


Step 1:

Remove plastic or paper film from both sides of acrylic or wood. Its much easier to do this now than after assembly.

NOTE: Occasionally the fabrication process will remove one or both sides. If you can see through the acrylic clearly then the film is gone.

Step 2:

Attach the power supply brackets using 4mm screws and either horizontal or vertical mounting bracket .

Design Specific Instructions for: MTM ACR4-18 Double Decker w/ HP Power

*IMPORTANT* - The HP Common Slot Power Supply designs do not attach with screws and this step should be skipped.

Step 3:

Attach bolts. The MTMACR8-72 has both 4” inch and 3” bolts, but not all designs have both. These should be inserted in the largest holes on the plate. See diagram below for bolt / washer / nut ordering. NOTE: Refer to your online design to find appropriate holes.


Step 4:

Attach 4/40 standoffs and k-nuts to smallest holes. No washer is needed.


Step 5:

Attach components to the standoff. No washer is needed.

Step 6:

Use self tapping screws to attach mounting plate to the enclosure. Holes should be medium size and in each corner of the mounting plate.

Step 7:

Design Specific Instructions for: MTM ACR4-18 Double Decker w/ HP Power

Set the HP Power supplies on the bottom shelf and place the mounting strip on top of the power supply. Place a washer and KNut on bolt and tighten the KNut bolts down on the mounting strip essentially clamping the power supply in place. Only tighten enough to hold the power supplies in place. Do not over tighten - you will warp or even break the acrylic.

If breakout board prevents power supply from laying flat on bottom plate, a separate set of clamps can be put on the bottom to provide clearance.

Step 8:

Insert upper shelf. Upper shelf sits directly on spacer and is attached with a K-Nut from the top. No washer is needed.

Step 9:

Wire it up and make it fancy.

Few tips:
  • Don’t tin your wires if inserting them into a screw down clamp. Solder will expand slightly and loosen the clamp.
  • Use fuse between power supplies and controllers. A lose connection could cause an arc and if unfused could damage your power supply or your controller and potentially cause a fire.
  • Make sure you use appropriate guage wire for the amperage you plan on needing. Small guage wire on high loads can cause greater voltage loss and in extreme cases start a fire.

View our timelapse of a JDeation Enclosure being wired up.

Step 10:

Post a picture of your killer new build to facebook - make sure you tag JDeation Designer!

Use our contact page if you require assistance with your build. This is a new service and we would love your feedback. What worked well, what didn’t work well?

Finished Build (outside of case)

Finished Build with wood plates (outside of case)