Trays
Trays hold the the electronics that your printer work: the "guts". The CPU tray slides in from the side of the front main body, while lower bay and MCU trays mount in the back main body.
CPU Tray
If you are using an SBC, you will need:
| Parts | Qty | Note |
|---|---|---|
| Single board computer | 1 | Here we use a Raspberry Pi 3B+ |
| CPU tray | 1 | CPU Tray - RPi 3B Plus.stl |
| M3 x 6mm machine screws | 4 | |
| M3 x 8mm machine screws | 4 |
Otherwise, you will need:
| Parts | Qty | Note |
|---|---|---|
| Unused CPU tray cover | 1 | Unused CPU Tray Cover.stl |
| M3 x 8mm machine screws | 4 |
Notes:
Note
The instructions below are for installing with an SBC. Skip the first step if using the unused CPU tray cover.
Note
The Raspberry Pi comes with M2.5 screw holes, but can be bored out easily with M3 machine screws.
| Step | Example |
|---|---|
| Place the Raspberry Pi on the CPU tray as pictured. Fasten with four (4) M3 x 6mm screws. |  |
| Slide the tray into the left side bay. |  |
| Use four (4) M3 x 8mm screws to fasten the tray in place. |  |
Lower Bay
Lower bay trays are specific to each configuration. You may need several trays or none at all. In the example below, we demonstrate mounting a full-length tray with a DROK 5 amp buck converter.
You will need:
| Parts | Qty | Note |
|---|---|---|
| Lower bay tray | 1 | |
| M3 x 8mm machine screws | 4 | All lower bay trays mount with four (4) of these. |
For this example, we also use:
| Parts | Qty | Note |
|---|---|---|
| DROK 5A Buck Converter | 1 | |
| Lower Bay - DROK 5A Buck with LED.stl | 1 | Full-length lower bay tray example. |
| M3 x 6mm machine screws | 2-4 | Can use any length up to 12mm for this tray. |
| Step | Example |
|---|---|
| Attach the buck converter to the tray using at least two (2) M3 x 6mm screws |  |
| Place the tray in the lower bay. If using a full-length tray, it must be oriented front to back, as in the picture. |  |
| Attach the tray with four (4) M3 x 8mm screws. |  |
MCU Tray
You will need:
| Parts | Qty | Note |
|---|---|---|
| MCU board | 1 | |
| MCU tray | 1 | |
| M3 x 6mm machine screws | 4 | Most boards mount using four (4) screws. |
| M4 x 8mm machine screws | 4 | All MCU trays mount with four (4) of these. |
In this example we use:
| Parts | Qty | Note |
|---|---|---|
| BigTreeTech Octopus | 1 | Example MCU. |
| MCU Tray - Octopus.stl | 1 | Example printed MCU tray. |
Note
The MCU tray has four M4 screw holes on the sides. Take note of the orientation of your board on the tray and where it will end up before mounting. Try to align your power connectors toward the back and SD card port to the front or sides.
| Step | Example |
|---|---|
| Attach your MCU to the tray with four (4) M3 x 6mm screws. |  |
| Place the tray in the case and check the orientation; the board's power supply connectors should face the rear. Secure the tray with four (4) M4 x 8mm screws. |  |
Before going further, it's a good time to connect wires from PSU to the devices we just added. Be careful of polarity.